KR20160083452A - Back light and liquid crystal display including the same - Google Patents

Abstract

The present invention relates to a backlight which is installed with a pad between a light guide plate and a light source array unit to prevent the light guide plate from being damaged as the light guide plate moves by external force, and to a liquid crystal display element with the same. According to the present invention, the liquid crystal display element comprises: a liquid crystal panel configured to realize an image; a light source array having a pad groove wherein light sources supplying light to the liquid crystal panel are arranged on one surface of the light source array; the light guide plate arranged in a lower portion of the liquid crystal panel; and a pad portion fastened to the pad groove to be in contact with a lateral side of the light guide plate.

Description

BACKLIGHT AND LIQUID CRYSTAL DISPLAY INCLUDING THE SAME BACKLIGHT AND LIQUID CRYSTAL DISPLAY INCLUDING THE SAME

The present invention relates to a backlight and a liquid crystal display device having the same.

2. Description of the Related Art Recently, various portable electronic devices such as a mobile phone, a PDA, and a notebook computer have been developed. Accordingly, there is a growing need for a flat panel display device for a light and small size. As such flat panel display devices, a liquid crystal display (LCD), a plasma display panel (PDP), a field emission display (FED), and a vacuum fluorescent display (VFD) have been actively studied. However, mass production technology, ease of driving means, , Liquid crystal display devices (LCDs) are mainly receiving the spotlight because of realization of a large-sized screen.

The liquid crystal display element is a transmissive display element and displays a desired image on the screen by adjusting the amount of light transmitted through the liquid crystal layer by refractive index anisotropy of liquid crystal molecules. Therefore, in a liquid crystal display element, a back light, which is a light source for providing light that transmits the liquid crystal layer for displaying an image, is provided. Generally, the backlight can be roughly divided into two types.

The first is a side-view backlight that is installed on the side of the liquid crystal panel to provide light to the liquid crystal layer, and the second is a direct-type backlight that provides light directly below the liquid crystal panel.

The direct-type backlight is mainly used to fabricate a liquid crystal panel for LCD TV since light emitted from a lamp is directly supplied to the liquid crystal layer and thus can be applied to a large-area liquid crystal panel as well as high brightness. However, the direct-type backlight requires a space for a light source and a structure for fastening the light source because the light source for emitting light is located at the lower portion of the liquid crystal panel, thereby increasing the overall thickness of the display device, There has been a problem in that it is not suitable for a large-area liquid crystal panel for an LCD TV, which has recently been spotlighted.

The side-type backlight is provided on the side surface of the liquid crystal panel and can supply light to the liquid crystal layer through the reflection plate and the light guide plate. Accordingly, since the thickness can be made thinner, it is mainly used for a notebook or the like requiring a thin display device, and a large-sized LCD TV is also required to have a thin thickness and a bezel.

On the other hand, as a backlight lamp, a light source that emits light by itself such as a light emitting device instead of a fluorescent lamp is used. Since the light emitting device emits R, G, and B monochromatic light, the color reproduction ratio is good when applied to a backlight and the driving power can be reduced.

FIG. 1 is a plan view showing a structure of a conventional liquid crystal display device, and FIG. 2 is a cross-sectional view taken along line I-I 'of FIG.

As shown in FIGS. 1 and 2, the liquid crystal display element includes a first substrate 1 and a second substrate 2, and a liquid crystal layer (not shown) between the first substrate 1 and the second substrate 2, An LED substrate 32 mounted on the lower side surface of the liquid crystal panel 10 and having a plurality of LEDs 34 for emitting light and mounted on the lower surface of the liquid crystal panel 10; A light guide plate 50 disposed between the liquid crystal panel 10 and the light guide plate 50 for guiding light emitted from the LED 34 and supplying the light to the liquid crystal panel 10, An optical sheet 38 composed of a diffusing sheet 38a and prism sheets 38b and 38c for diffusing and condensing the light supplied to the liquid crystal panel 10 and a light guide plate 50 disposed below the light guide plate 50, A light guide plate 50, an optical sheet 38, and an LED substrate 32 are accommodated in a space defined by the reflector 36, A light guide plate 50, an optical sheet 38 and an LED substrate 32 are assembled together with the lower cover 40 and the liquid crystal panel 10 is placed thereon, And a top cover 60 coupled to the main support portion 62 to assemble the liquid crystal panel 10. The main cover 62 includes a main support portion 62,

The first substrate 1 of the liquid crystal panel 10 is a thin film transistor array substrate on which thin film transistors are formed. In addition to the thin film transistors, various wirings and pixel electrodes are formed on the first substrate 1. The second substrate 2 is a color filter substrate, and a color filter layer and a black matrix are formed.

The lower cover 40 assembles a backlight composed of a reflective plate 36, a light guide plate 50, an optical sheet 38, an LED 34, and the like, and the wall surface extends upward from the bottom surface, The backlight is assembled by placing parts inside the wall surface. The upper cover 60 is assembled with the main support part 62 and the lower cover 40 to assemble the liquid crystal panel 10 and the backlight.

In the liquid crystal display device having the above-described structure, light emitted from the LED 34 is incident on one side of the light guide plate 50, and then proceeds to the other side. At this time, although not shown in the drawing, a light reflection plate is formed on the lower surface of the light guide plate 50, and the light incident on the lower surface of the light guide plate 50 is reflected by the reflection pattern and is incident on the liquid crystal panel 10 through the upper surface An image is implemented on the liquid crystal panel 10. [

However, the following problems arise in the liquid crystal display element having the above-described structure.

Generally, liquid crystal display devices are also used in fixed electronic devices such as large TVs, but they are mainly used in electronic devices such as cellular phones and tablet PCs that can be carried and electronic devices such as instrument panels of vehicles. Such a portable electronic device or a vehicle electronic device is used while moving along with an operator or on the move, so that a constant shaking phenomenon called hand shaking occurs.

Meanwhile, the light guide plate 50 assembled to the lower cover 40 is disposed at a predetermined distance from the lower cover 40 in consideration of assembly tolerances and the like. 2, when a liquid crystal display device is assembled, a gap of a predetermined distance is formed between the lower cover 40 and the light guide plate 50. Such a gap may be a distance between the light guide plate 50 50 may flow inside the lower cover 40 to collide with the LED 34 and cause the light guide plate or the LED 34 to be damaged. Further, the bottom cover, the main support, and the top cover thicken the bezel of the panel side portion and complicate backlight assembly.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a backlight capable of preventing a light guide plate from being broken due to an external force due to an external force by providing a pad between a light guide plate and a light source array unit, and a liquid crystal display .

Another object of the present invention is to provide a backlight with reduced bezel and a liquid crystal display device having the simplified assembly structure in assembling the backlight unit and the panel.

In order to achieve the above object, a liquid crystal display device according to the present invention includes a liquid crystal panel for realizing an image, a light source for supplying light to the liquid crystal panel, and a light source array part having the light source arranged on one surface thereof. A light guide plate disposed under the liquid crystal panel, a lower cover for receiving the liquid crystal panel and the light guide plate, a main support assembled with the lower cover and surrounding a side surface of the liquid crystal panel, at least one opening Wrap the panel sides with the guide panel. Further, a plate is disposed between the lamp housing and the lamp housing, the lamp housing being in contact with the light source array and including a plurality of stepped portions and concavities and convexities. A pad groove disposed at a predetermined interval in the light source array portion, and a pad portion that spans the pad groove and contacts the side surface of the light guide plate.

A plurality of stepped portions are configured to be held in contact with the light source array and the pad portion and the convex portions of the concave and convex portions of the lamp housing come into contact with the plate to more firmly support the lower portion of the panel.

The pad portion is exposed through an opening of the guide panel, and the pad portion is composed of a flat portion, an extending portion, and a hook portion. The hook portion of the pad portion is thicker than the light source of the light source array, and the width of the extension portion of the pad portion is smaller than the plane portion, and is formed larger than the hook portion.

In the present invention, a pad portion is provided between the light guide plate and the lower cover to prevent a light source or a light guide plate from being broken or a defective image quality due to a hand shaking phenomenon.

Also. It is possible to fix the light guide plate with the pad portion to prevent the light guide plate from being deformed due to thermal expansion of the light guide plate at a high temperature

Further, in the present invention, one side of the pad portion overlaps with the opening formed in the guide panel, thereby simplifying the assembling structure and reducing the bezel.

Also, the lamp housing having the stepped portion can be used to firmly fix the pad portion and to simplify the shape of the lower cover.

1 is a plan view showing a structure of a conventional liquid crystal display element.
2 is a cross-sectional view taken along the line I-I 'in Fig. 1;
3 is an exploded perspective view of a liquid crystal display element according to the present invention.
4 is a perspective view of a liquid crystal display according to the present invention.
Fig. 5 is an enlarged view of area A in Fig. 4; Fig.
6 is a sectional view of II-II 'of FIG. 5;
7 is an enlarged view of a lamp housing and a light source array of a liquid crystal display element according to the present invention.
7A is a view of a light source array of a liquid crystal display element according to the present invention.
8 is a view of a pad portion according to the present invention.
9 is an enlarged view of a pad portion according to the present invention and a part of a light source array fastened thereto;

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if a temporal posterior relationship is described by 'after', 'after', 'after', 'before', etc., 'May not be contiguous unless it is used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

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

The present invention can be applied to liquid crystal display devices of all structures in which a handshaking phenomenon occurs. For example, the present invention is applied not only to liquid crystal display devices of portable electronic devices such as a large-sized TV, a mobile phone, and a tablet PC, but also to a liquid crystal display device installed in an instrument panel of an automobile or an airplane.

In general, liquid crystal display devices are manufactured through various inspections. Such inspections include inspections related to the operation of liquid crystal display devices such as appearance inspections and light inspections, and inspections for confirming the reliability of liquid crystal display devices performed under high temperature conditions have.

Among these inspections, since the reliability test at a high temperature is carried out at a high temperature of about 80 DEG C or more, the light guide plate made of PMMA (Polymethyl-Methacrylate) or polyethylene terephthalate (PET) When the volume of the light guide plate due to thermal expansion increases, the light guide plate is bent upward or downward.

Such deflection of the light guide plate not only prevents the uniform light from being supplied due to the change of the light output direction when the light is guided to the panel, but also an external force is applied to the panel by the stress of the light guide plate during assembly of the liquid crystal display device, Defects such as mura are generated.

The warping phenomenon of the light guide plate occurs not only in the reliability test at a high temperature but also in a high-temperature electronic device use environment. For example, when an electronic device is used for a long period of time in an outdoor environment where sunlight is constantly irradiated at a high temperature, the temperature of the electronic device rises to a very high temperature.

Further, when the liquid crystal display device is applied to the instrument panel of an automobile, the temperature of the liquid crystal display element of the automotive instrument panel is higher than that of general electronic devices due to heat generation due to vehicle operation and heat generation due to continuous examination of sunlight So that the light guide plate is deformed more frequently.

In the present invention, by disposing the pad portion, the light guide plate is prevented from flowing and the light guide plate is fixed to prevent the light guide plate from being bent upward or downward.

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

The liquid crystal panel 110 (hereinafter referred to as a panel) includes a first substrate and a second substrate, and a liquid crystal layer (not shown) between the first substrate and the second substrate.

Although not shown in the drawing, the panel 110 includes a first substrate and a second substrate. The first substrate includes a plurality of gate lines and data lines arranged vertically and horizontally to define a plurality of pixel regions, A thin film transistor and a pixel electrode, which are switching elements, are formed in the pixel region. The thin film transistor includes a gate electrode connected to a gate line, a semiconductor layer formed by stacking amorphous silicon or the like on the gate electrode, and a source electrode and a drain electrode formed on the semiconductor layer and connected to the data line and the pixel electrode .

The second substrate is divided into a color filter composed of a plurality of sub-color filters implementing the colors of red (R), green (G) and blue (B) And a black matrix for blocking light transmitted through the layer.

The first substrate and the second substrate are bonded together to face each other by a sealant (not shown) formed on the periphery of the image display area to constitute a liquid crystal panel, (Not shown) formed on the first substrate or the second substrate.

The panel 110 is placed on the light guide plate 120 with the optical sheets attached to the upper and lower portions thereof. The light guiding plate 120 guides the light input from the light source to the liquid crystal panel 110. The light incident on one side surface of the light guiding plate 120, that is, the light entering surface is reflected on the inner upper surface and the lower surface of the light guiding plate 120, Propagated to the side, and then output to the panel side. At this time, the light guide plate 120 is made equal to or larger than the panel 110. The light guide plate 120 is formed of a material such as polymethyl-methacrylate (PMMA), glass, or polyethylene terephthalate (PET), and an engraved pattern or a relief pattern is formed on the lower surface thereof.

Light incident into the light guide plate 120 through the light incident surface of the light guide plate 120 is reflected by the upper surface and the lower surface inside the light guide plate 120 and propagates to a side opposite to the light entrance surface. The light incident on the upper surface of the light guide plate 120 at a critical angle or more with respect to the normal to the upper surface of the light guide plate 120 is totally reflected and propagated from the upper surface of the light guide plate 120 to the inside of the light guide plate 120, And is supplied to the panel 110.

The panel 110 and the light guide plate 120 are seated on the lower cover 150 and the lower cover 150 is a flat type of electro-galvanized steel sheet (EGI) or ACM (Advanced Composite Material) And can be formed in a shape having a curved portion to support a large panel. A plate 160 is disposed under the lower cover 150 to prevent warpage of the lower cover 150.

In the case of a large-area TV, the lower cover 150 of a thin EGI or ACM material may be bent with a weaker stiffness than the size, so that the plate 160 made of the same material as the lower cover 150 is additionally fastened .

The lamp housing 170 is fastened to the rear surface of the plate 160 and has a concavo-convex shape. The lamp housing is made of a material having high thermal conductivity such as aluminum (Al) or stainless steel (SUS) to support a part of the light source array 130 and the light guide plate 120, and emits heat generated from the light source.

The main supports 180 are positioned on side portions of the panel 110 where the light source arrays are not located and are coupled to each other to have a shape. In addition, the main support 180 has a stepped portion so that the outer periphery of the panel 110 can be covered, and the main support 180 is engaged with the side surfaces of the light guide plate 120 and the lower cover 150,

The light source array 130 is located at one side of the panel 110. As the light source (LED), R, G, B LEDs emitting white light of R (Red), G (Green) and B (Blue) or LED devices emitting white light can be used.

When monochromatic LEDs emitting monochromatic light are arranged, monochromatic LEDs of R, G, and B are alternately arranged at regular intervals to mix monochromatic light emitted from the LEDs into white light and then to the liquid crystal panel 110, A plurality of LED elements are arranged at regular intervals to supply white light to the liquid crystal panel 110. [

The white light LED device comprises a blue LED that emits blue light and a phosphor that emits yellow light by absorbing blue monochromatic light. The blue monochromatic light output from the blue LED and the yellow monochromatic light emitted from the phosphor are mixed to form a liquid crystal And is supplied to the panel 110. Although the light source array 130 is disposed on one side of the light guide plate 120 in the drawing, the light source arrays 130 may be disposed on both sides of the light guide plate 120.

Although not shown, a flexible circuit board is attached to the light source array 130, and wires are attached to the flexible circuit board. The flexible circuit board and the wire connect a light source (LED) mounted on the light source array 130 to a driving circuit portion outside the liquid crystal display device, and an external signal is supplied to the light source controller. In accordance with the input signal, (LED). On the other hand, in the present invention, LEDs are exemplified and described as light sources for convenience of explanation, and the light source of the present invention is not limited to LEDs.

The light source array 130 maintains a certain distance from one side of the panel 110 and maintains a predetermined distance from the side surface of the light guide plate 120. The pad unit 140 fastened to the light source array 130 at this time is separated from the light guide plate 120 To keep the distance between the light source and the light guide plate constant.

4 is a perspective view of a liquid crystal display according to the present invention. FIG. 4 shows a structure in which the liquid crystal display device according to the present invention is assembled. When the upper cover (not shown) is fastened to one side of the panel 110 where the guide panel 190 is located, the assembly of the liquid crystal display device is completed. As shown in the figure, the side portions of the panel 110 are supported on the step portions of the main support 180 to minimize the bezel portions.

5 is an enlarged view of region A in Fig. The light source array 130 is fixed by the guide panel 190. The guide panel 190 is coupled to the light source array 130 and the lamp housing 170 through a hole H using a screw or the like to form an opening for exposing the pad portion 140. The opening can prevent the light guide plate 120 from flowing and breaking by allowing the pad portion to abut against the upper cover covering the side surface and the upper surface of the guide panel.

6 is a cross-sectional view of II-II 'of FIG.

The panel 110 formed of the first substrate and the second substrate includes an optical sheet 112 formed of a diffusing sheet and a prism sheet that is guided by the light guide plate 120 and diffuses and condenses light supplied to the panel 110, A polarizing sheet 111, which polarizes the emitted light and displays an image, is attached and positioned on the light guide plate 120. The panel 110 and the light guide plate 120 are supported by the lower cover 150 and the plate 160. The lamp housing 170 includes a plurality of stepped portions 170a and 170b and concavo-convex portions. Convex portion 171 of the concave-convex portion comes into contact with and supports the plate. The lamp housing supports a part of the light guide plate. The first step part 170a abuts a part of the pad part 140 to fix the pad part 140. The second step part 170b fixes the pad part 140, 130 and fixes the light source array 130. The side surface portion of the lamp housing 170 between the first step portion 170a and the second step portion 170b of the lamp housing 170 is in contact with the heat radiation pad TP attached to the light source array 130, The generated heat can be transferred to the lamp housing 170 to be radiated. The lamp housing 170 is formed in a concavo-convex shape to widen the heat dissipation area, and to be more effectively radiated due to the space between the convex portion and the concave portion of the concave-convex portion. The guide panel 190 is formed with an opening through which the pad 140 is exposed on the side surface to further increase the thickness of the bezel to prevent the pad 140 from being extended. 200) so that they can be fixed. A protrusion for preventing the pad 140 from moving is formed at the upper end of the guide panel 190. The protrusion formed at the stepped portion 170a of the lamp housing and the upper end of the guide panel 190 prevents the pad portion 140 from flowing. The upper cover 200 covers the side and upper surfaces of the guide panel 190 and a part of the panel 110 to improve the light leakage caused by the light source located on the side of the panel 110, Thereby preventing the pad portion from flowing.

FIG. 7 is an enlarged view of a lamp housing and a light source array of a liquid crystal display according to the present invention, and FIG. 7A is a view of a light source array of a liquid crystal display according to the present invention.

The lamp housing 170 is fastened to the plate 160 and the lower cover 150 through a hole H using a screw or the like.

A light source (LED) is positioned on one surface of the light source array 130 and a hole H is formed therein so that the guide panel 190 and the lamp housing 170 can be fastened using a screw or the like. The heat radiating pad disposed on one side of the light source array 130 contacts the lamp housing and transfers heat generated by the driving of the light source to the lamp housing 170. As a result, heat generated from the light source can be dissipated, shortening the lifetime of the light source due to heat generation and preventing panel malfunction. A pad groove 130H is formed on the light source array 130 to be coupled to the pad portion. The pad groove 130H is located between the light sources (LEDs) and is formed to have a smaller width than the spacing distance between the light sources (LEDs).

FIG. 8 is a view of a pad unit according to the present invention, and FIG. 9 is an enlarged view of a pad unit according to the present invention and a part of a light source array fastened thereto.

The pad portion 140 may be formed of a silicone-based material having elasticity or may be formed of polycarbonate having high strength. The pad unit 140 includes a flat surface portion 141 contacting the one surface of the light source array 130 where the light source is not positioned and an extending portion 142 protruding from the upper center of the flat surface portion 141 and located in the pad groove 130H. And a hook 143 protruding downward from the extension 142 and located in a space between the light sources. The hook portion 143 contacts the side surface of the light guide plate 120 and the extension portion 142 connects the flat surface portion 141 and the hook portion 143. The thickness L1 of the hook portion 143 is formed to be larger than the thickness L2 of the light source LED to maintain a gap between the light guide plate and the light source in contact with one side of the light guide plate to prevent the light guide plate from flowing. The width W1 of the hook portion 143 of the pad portion 140 is formed to be smaller than the distance between the light sources of the light source array 130 to prevent the light source LED from being damaged, The width W2 of the extended portion 142 of the latch portion 142 is formed to be equal to or larger than the width of the pad groove 130H larger than the width W1 of the latch portion 142 so that the pad portion is not detached after being fastened to the pad groove 130H . The width W3 is smaller than the opening of the guide panel 190 so that the maximum area of the flat surface portion 141 of the pad portion 140 can be in contact with the upper case, but the width of the hook portion 143 and the extending portion 142 (W1, W2).

Although the liquid crystal display element having the specific structure has been described in the above description, the present invention is not limited to the liquid crystal display element having such a specific structure.

In the present invention, a pad portion is provided between the light guide plate and the lower cover to prevent a light source or a light guide plate from being broken or a defective image quality due to a hand shaking phenomenon.

In addition, when the pad portion is fastened to the light source array, the assembly structure is simplified by assembling the pad portion into the groove of the light source array without requiring any other components.

Further, in the present invention, the guide panel and the upper cover are formed on only one side of the panel where the light source is located, and the other side of the panel on which the light source is not positioned is assembled using only the main support.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

Therefore, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also within the scope of the present invention.

110: panel 120: light guide plate
130: Light source array 150: Lower cover
160: Plate 170: Lamp housing
180: Main support 190: Guide panel
140: pad portion

Claims (14)

A liquid crystal panel for realizing an image;
A light source array having light sources for supplying light to the liquid crystal panel and having pad grooves;
A light guide plate disposed under the liquid crystal panel; And
And a pad portion that contacts the side surface of the light guide plate over the pad groove. The method according to claim 1,
A lower cover for accommodating the liquid crystal panel and the light guide plate;
A main support assembled with the lower cover and surrounding a side surface of the liquid crystal panel;
A guide panel which surrounds the other surface and the upper surface of the light source array and has at least one opening portion;
A lamp housing contacting the light source array and including a plurality of stepped portions and concave / convex portions; And
And a plate disposed between the lower cover and the lamp housing. The liquid crystal display device according to claim 2, wherein a part of the surface of the lamp housing supports the light guide plate, the plurality of stepped portions contact the light source array and the pad portion, and the convex portions of the concave and convex portions contact the plate. The liquid crystal display of claim 2, wherein the pad portion is exposed through an opening of the guide panel. The liquid crystal display device according to claim 1, wherein the pad portion includes a flat portion abutting the other surface of the light source array, a hook portion contacting the side surface of the light guide plate, and an extension portion connecting the flat portion and the hook portion. . The liquid crystal display according to claim 1, wherein the thickness of the hook portion is thicker than the thickness of the light source of the light source array. The liquid crystal display of claim 1, wherein a width of the extending portion is smaller than a width of the flat portion, and is larger than a width of the hook portion. A light source array having light sources for supplying light and disposed on one surface and having pad grooves;
A light guide plate disposed on the other surface of the light source array;
And a pad portion covering the pad groove and contacting the side surface of the light guide plate. 9. The method of claim 8,
A lower cover disposed below the light guide plate;
A main support assembled to a side surface of the lower cover;
A guide panel which surrounds the other surface and the upper surface of the light source array and has at least one opening portion;
A lamp housing contacting the light source array and including a plurality of stepped portions and concave / convex portions; And
And a plate disposed between the lower cover and the lamp housing. The backlight according to claim 9, wherein a part of the surface of the lamp housing supports the light guide plate, the plurality of stepped portions contact the light source array and the pad portion, and the convex portions of the concave and convex portions contact the plate. The backlight unit according to claim 9, wherein the pad unit is exposed through an opening of the guide panel. The liquid crystal display device according to claim 8, wherein the pad portion includes a flat portion abutting the other surface of the light source array, a hook portion contacting the side surface of the light guide plate, and an extending portion connecting the flat portion and the hook portion. . 13. The backlight according to claim 12, wherein a thickness of the hook portion is thicker than a thickness of the light source of the light source array. 13. The backlight according to claim 12, wherein a width of the extending portion is smaller than a width of the flat portion and larger than a width of the hook portion.

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