KR20120072958A - Back light and liquid crystal display device having thereof - Google Patents

Abstract

PURPOSE: A backlight and a liquid crystal display device with the same are provided to use silicon resins whose refractive indexes are similar to the refractive indexes of a sealing material of the LED and the light guide plate. CONSTITUTION: A plurality of LED(Light Emitting Diodes)s(134) emit light. A light guide plate(135) faces the LEDs. The light guide plate guides light which is incident from the LEDs. A light guide member(160) is arranged between the light guide plate and the LEDs. The light guide member blocks heat of the LED. The light guide member guides the light of the LED to the light guide plate.

Description

BACK LIGHT AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight, and more particularly, to an LED backlight and a liquid crystal display device including the same, in which a defect does not occur due to heat and impact.

Recently, with the development of various portable electronic devices such as mobile phones, PDAs, and notebook computers, there is a growing demand for flat panel display devices for light and thin applications. Such flat panel displays have been actively researched, such as liquid crystal displays (LCDs), plasma display panels (PDPs), field emission displays (FEDs), and vacuum fluorescent displays (VFDs). Currently, liquid crystal displays (LCDs) are mainly in the spotlight for the realization of large-area screens.

The liquid crystal display is a transmissive display and displays a desired image on the screen by controlling the amount of light passing through the liquid crystal layer by the refractive index anisotropy of the liquid crystal molecules. Accordingly, in the liquid crystal display device, a back light, which is a light source passing through the liquid crystal layer, is provided for displaying an image. In general, the backlight can be classified into two types.

The first is a side type backlight that is provided 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 under the liquid crystal panel.

The side backlight may be installed on the side of the liquid crystal panel to supply light to the liquid crystal layer through the reflection plate and the light guide plate. Therefore, since the thickness can be made thin, it is mainly used in notebooks and the like which require a thin display device. However, the side backlight is difficult to apply to a large area liquid crystal panel because the lamp for emitting light is located on the side of the liquid crystal panel, it is difficult to obtain high brightness because light is supplied through the light guide plate. Therefore, there has been a problem that it is not suitable for the large-area liquid crystal panel for LCD TVs, which is in the spotlight recently.

The direct type backlight is used to manufacture a liquid crystal panel for an LCD TV since the light emitted from the lamp is directly supplied to the liquid crystal layer and can be applied to a large area liquid crystal panel as well as high brightness.

On the other hand, in recent years, as a lamp of the backlight, instead of a fluorescent lamp, a light source that emits light itself, such as a light emitting device (Light Emitting Device). Since the light emitting device emits R, G, and B monochromatic light, it has the advantage of good color reproduction and reduction of driving power when applied to the backlight.

1 is an exploded perspective view showing the structure of a conventional liquid crystal display device having a backlight having the LED as described above, and FIG. 2 is a cross-sectional view of the liquid crystal display device in which the backlight and the liquid crystal panel are assembled.

 As shown in FIGS. 1 and 2, the liquid crystal display device includes a first substrate 1 and a second substrate 3 and a liquid crystal layer (not shown) therebetween, so that an image is generated as a signal is applied from the outside. The liquid crystal panel 10 for implementing the LED substrate 32 is disposed on the lower side of the liquid crystal panel 10 and a plurality of LEDs 34 for emitting light, and the lower portion of the liquid crystal panel 10 A light guide plate 35 disposed in the light guide plate 35 to guide the light emitted from the LED 34 to the liquid crystal panel 10, and between the liquid crystal panel 10 and the light guide plate 35 to be guided by the light guide plate 35. And an optical sheet 38 including diffusion sheets 38a and prism sheets 38b and 38c for diffusing and condensing light supplied to the liquid crystal panel 10, and disposed below the light guide plate 35. Reflector plate 36 for reflecting light guided to the lower portion of the light source, the reflector plate 36, the light guide plate 35, the optical sheet 38 and the LED substrate 32 is accommodated The lower cover 40 and the lower cover 40 are combined to assemble the reflective plate 36, the light guide plate 35, the optical sheet 38, and the LED substrate 32, and the liquid crystal panel 10 is positioned thereon. The guide panel 42 and the upper cover 46 is assembled with the guide panel 42 to assemble the liquid crystal panel 10.

The first substrate 1 of the liquid crystal panel 10 is a thin film transistor array substrate on which a thin film transistor is formed. The first substrate 1 includes not only a thin film transistor but also various wirings and pixel electrodes. 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 layer 36, a light guide plate 35, an optical sheet 38, an LED 34, and the like, and a wall surface thereof extends upward from a bottom surface thereof. The backlights are assembled by placing parts inside the wall. The upper cover 46 is assembled with the guide panel 42 and the lower cover 40 to assemble the liquid crystal panel 10 and the backlight. The LED substrate 32 is disposed on the rear surface of the reflecting plate 36. Therefore, the front surface of the LED substrate 32, that is, the surface on which the LED 34 is mounted, is located on the rear surface of the reflector plate 36.

However, the liquid crystal display device having the above structure has the following problem.

As shown in FIG. 2, the LED 34 and the light guide plate 35 are adjacent to each other. Therefore, when the LED 34 emits light, the heat generated from the LED 34 increases the temperature of the light incident portion of the light guide plate 35, and the increase in temperature causes the deformation of the light incident portion of the light guide plate 35. The deformation of the light incident part causes a lot of problems in the incident and delivery of light, and thus the light quality is not uniformly supplied to the region of the liquid crystal panel 10 corresponding to the light incident part.

In addition, a pad 44 is disposed in an area where the guide panel 42 and the light guide plate 35 contact each other. Typically, the upper surface of the light guide plate 35 forms a plurality of lens shapes in order to diffuse the emitted light. When the surface of the lens shape contacts the guide panel 42, the surface of the light guide plate 35 may be damaged by external impact or the like. Since the pad 44 is formed of a foam material or the like in a region where the guide panel 42 and the light guide plate 35 are in contact with each other, the shock between the guide panel 42 and the light guide plate 35 is absorbed to prevent damage to the light guide plate. (35) It is to prevent surface damage.

However, as shown in FIG. 2, since the pad 44 is adjacent to or partially in contact with the LED 34, the pad 44 is damaged by the high heat generated when the LED 34 emits light. There was.

The present invention is to solve the above problems, by placing a light guide member made of a silicone-based resin between the LED and the light guide plate, a backlight and a liquid crystal display device having the same that can prevent the light guide plate from being deformed by heat generated from the LED It aims to provide.

In order to achieve the above object, the backlight according to the present invention comprises a plurality of LEDs for emitting light; A light guide plate guiding light incident from the LED facing the LED; And a light guide member disposed between the LED and the light guide plate to block heat generated from the LED and guide light emitted from the LED to the light guide plate.

In addition, the backlight is an LED substrate on which the LED is mounted; A reflective layer disposed on the light guide member; And a reflecting plate disposed under the light guide plate to reflect light incident on the lower surface of the light guide plate, wherein the light guide member is partially extended to the bottom surface of the reflecting plate. In this case, the light guide member is made of a silicone-based resin.

In addition, the liquid crystal display device according to the present invention comprises a liquid crystal panel for implementing an image; A backlight unit including a plurality of LEDs emitting light, and a light guide plate for guiding light emitted from the LED to the liquid crystal panel facing the LEDs; A guide panel supporting the liquid crystal panel; A lower cover and an upper cover fastened to the guide panel to assemble the liquid crystal panel and the backlight; And a light guide member disposed between the LED and the light guide plate to block heat generated from the LED in contact with the LED, the light guide plate, the guide panel, and the lower cover, and guide light emitted from the LED to the light guide plate.

In the present invention, the following effects can be obtained.

First, in the present invention, since the LED encapsulant and the silicone resin having a refractive index similar to that of the light guide plate are used between the LED and the light guide plate, refraction hardly occurs when the light emitted from the LED is incident on the light guide plate, resulting in light loss due to refraction. It can be minimized to prevent the light efficiency is lowered.

Second, in the present invention, the light guide member acts as a heat insulator, thereby preventing the light incident surface of the light guide member from being deformed by heat generated from the LED.

Third, in the present invention, since the light guiding member firmly assembles the LED and the light guiding plate, it is possible to prevent the LED and the light guiding plate from being incorrectly assembled by the impact from the outside.

Fourth, in the present invention, since the light guide member absorbs the impact applied from the outside, the LED and the light guide plate can be prevented from being damaged, and in addition, expensive pads conventionally used to absorb the impact are not required, thereby reducing manufacturing costs. It becomes possible.

1 is a perspective view of a conventional liquid crystal display device.
2 is a cross-sectional view of a conventional liquid crystal display device.
3 is a perspective view of a liquid crystal display device according to the present invention.
4 is a cross-sectional view of a liquid crystal display device according to the present invention.

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

The best way to prevent the light guide plate from being deformed by the heat generated from the LED is to increase the spacing between the LED and the light guide plate so that the heat generated when the LED emits light does not reach the light guide plate. However, when arranging the LED and the light guide plate, the LED and the light guide plate are arranged by calculating an incident angle at which light emitted from the LED is incident on the light incident surface of the light guide plate. Therefore, if the distance between the LED and the light guide plate is increased, the angle of incidence of light incident on the light incident surface of the light guide plate is changed, so that the entire backlight must be redesigned, and thus the material or arrangement of other components of the backlight must be changed.

In addition, when the gap between the LED and the light guide plate is increased, when the liquid crystal display device is completed, a bezel, which is an outer region of the liquid crystal display device, increases, thereby increasing the size of the liquid crystal display device.

In the present invention, in order to prevent the light incident surface of the light guide plate from being deformed by heat generated from the LED, the gap between the LED and the light guide plate is increased or a separate light guide member is inserted between the LED and the light guide plate without additional design changes. It directs light and blocks heat from the LEDs. Such a light guide member not only blocks heat but also absorbs an impact applied from the outside to secure the LED to the backlight when the LED is assembled to the backlight.

3 and 4 are views showing the structure of a liquid crystal display device according to an embodiment of the present invention, Figure 3 is an exploded perspective view and Figure 4 is a cross-sectional view showing a combined structure.

As shown in FIG. 3 and FIG. 4, the liquid crystal display device according to the exemplary embodiment of the present invention includes a liquid crystal panel 110 and a backlight. The liquid crystal panel 110 is composed of a first substrate 101 and a second substrate 103 and a liquid crystal layer (not shown) therebetween to implement an image as a signal is applied from the outside.

The backlight is disposed on a lower side of the liquid crystal panel 110 and includes an LED substrate 132 on which a plurality of LEDs (Light Emitting Devices) 134 are mounted, and is disposed below the liquid crystal panel 110. A light guide plate 135 for guiding the light emitted from the light source 134 to be supplied to the liquid crystal panel 110, and provided between the liquid crystal panel 110 and the light guide plate 135 to be guided by the light guide plate 135 to provide a liquid crystal panel ( An optical sheet 138 made up of diffusion sheets 138a and prism sheets 138b and 138c for diffusing and condensing the light supplied to 110, and disposed under the light guide plate 135 and directed to the bottom of the light guide plate 35. It consists of a reflecting plate 136 for reflecting the light.

The reflective plate 136, the light guide plate 135, and the optical sheet 138 of the backlight are accommodated in the lower cover 140, and then assembled as the lower cover 140 and the guide panel 142 are coupled to each other.

The liquid crystal panel 110 is placed on the guide panel 142. The guide panel 142 is formed in a quadrangular shape such that an edge region of the liquid crystal panel 110 is placed on the guide panel 142.

An upper cover 146 is disposed in an upper edge region of the liquid crystal panel 110, and the upper cover 146 is combined with the lower cover 140 and the guide panel 142, thereby assembling the liquid crystal panel 110 and the backlight. Thus, the liquid crystal display device is completed.

Although not shown in the drawing, a plurality of gate lines and data lines are formed on the first substrate 101 vertically and horizontally to define a plurality of pixel regions, and thin film transistors, which are switching elements, are formed in each pixel region. The formed pixel electrode is formed on the pixel region. The thin film transistor may include a gate electrode connected to a gate line, a semiconductor layer formed by stacking amorphous silicon, etc. on the gate electrode, 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 102 is a color filter composed of a plurality of sub-color filters for implementing red (R), green (G), and blue (B) colors, and the sub-color filter. It is composed of a black matrix that separates and blocks light that passes through the liquid crystal layer.

The first substrate 101 and the second substrate 102 configured as described above are joined to face each other by a sealant (not shown) formed on the outer side of the image display area to form a liquid crystal panel. The first substrate 101 ) And the second substrate 102 are bonded through a bonding key (not shown) formed on the first substrate 101 or the second substrate 102.

In addition, although not shown in the drawing, the first and second substrates 102 and 102 are attached to the first polarizing plate and the second polarizing plate, respectively, to polarize the light input and output to the liquid crystal panel 110 to display an image. Implement

The light guide plate 135 is for guiding light input from the LED 134 to the liquid crystal panel 110, and the light incident on one side of the light guide plate 135 is reflected from the top and bottom surfaces of the light guide plate 135 to the other side. After propagation, the light is output to the outside of the light guide plate 135. In this case, the light guide plate 135 may be formed of a rectangular parallelepiped, and a pattern or a groove may be formed on the lower surface of the light guide plate 135 to form a lens shape or a groove on the upper surface thereof. In this case, as the light guide plate 113, a material having good light transmittance in the visible light region and good mechanical properties and chemical resistance, such as polymethylmethacrylate (PMMA), is used.

The optical sheet 138 is supplied to the liquid crystal panel 110 to improve the efficiency of light output from the light guide plate 135. The optical sheet 138 includes a diffusion sheet 138a for diffusing the light output from the light guide plate 138 and a first light for condensing the light diffused by the diffusion sheet to supply uniform light to the liquid crystal panel 110. The prism sheet 138b and the second prism sheet 138c. At this time, the diffusion sheet 138a is provided with one sheet, but the prism sheet is provided with a first prism sheet 138b and a second prism sheet 138c in which the prism crosses vertically in the x, y-axis direction. The light improves straightness by refracting the light in the axial direction.

The LED 134 may be an R, G, B LED that emits monochromatic light of R (Red), G (Green), B (Blue), or an LED device that emits white light.

When the LED emitting monochromatic light is arranged, the monochromatic light LEDs of R, G, and B are alternately arranged at regular intervals, and the monochromatic light emitted from the LED is mixed with white light and then supplied to the liquid crystal panel 110 to emit white light. When the LED device is provided, the plurality of LED devices are arranged at a predetermined interval to supply white light to the liquid crystal panel 110.

In this case, the white light LED element is composed of a blue LED emitting blue light and a phosphor absorbing blue monochromatic light to emit yellow light, and the blue monochromatic light output from the blue LED and the yellow monochromatic light emitted from the phosphor are mixed to form a white light. It is supplied to the panel 110. Although the LED 134 is disposed on one side of the light guide plate 135 in the drawing, the LED 134 may be disposed on both side surfaces of the light guide plate 135.

The LED 134 is mounted on an LED substrate 132 made of a metal or a flexible film. The LED substrate 132 is disposed along the side of the light guide plate 135 to face the side of the light guide plate 135, and the LED 134 is mounted on the LED substrate 132 so that the side of the light guide plate 135 is disposed. Light of the LED 134 is incident to the light guide plate 135 through the light guide plate 135.

Although not shown in the drawing, the LED substrate 132 is connected to an external driving circuit unit so that an external signal is supplied with a signal and power to the LED controller, and the LED controller drives the LED 134 according to the input signal. . In addition, a flexible printed circuit board (not shown) is attached to the LED substrate 132, and the flexible printed circuit board is connected to an external driving circuit unit. Signal wirings are formed on the upper and / or lower surface of the flexible circuit board, and the signal of the driving circuit unit is input to the LED substrate 132 through the signal wiring of the flexible circuit board.

The lower cover 140 includes a bottom surface positioned below the reflective plate 136 and a wall surface fixing the side surface of the light guide plate 135 and the rear surface of the LED substrate 132, and the reflective layer 136 and the light guide plate 135. The optical sheet 138 and the like are stored to assemble the backlight. In addition, an external driver 160 is provided outside the lower cover 140 to apply a signal to the liquid crystal panel 110 and the LED 134.

The guide panel 142 is coupled to the lower cover 140 in a form in which an upper surface surrounds an edge of the optical sheet 138 of the liquid crystal panel 110 and a side surface of the lower cover 140. The liquid crystal panel 110 is seated on the upper surface of the guide panel 142, and the upper cover 146 covers the outer region of the liquid crystal panel 110 to assemble the liquid crystal panel 110 and the backlight.

Although not shown in the drawings, the reflective plate 136 may extend not only to the bottom surface of the light guide plate 135 but also to a part of the side surface and the top surface of the light guide plate 135. That is, the reflective plate 136 on the side where the LED 134 is disposed may be formed to remove a region corresponding to the LED 134 to form a window (not shown), and the LED 134 is disposed on the window. Can be.

In the liquid crystal display device having the above structure, the reflective plate 136, the light guide plate 135, and the optical sheet 138 are disposed on the lower cover 140, and the guide panel 142 is disposed thereon, and the guide panel 142 is disposed on the guide panel 142. After the liquid crystal panel 110 is disposed, the lower cover 140 and the guide panel 142 are assembled by fastening with the upper cover 146.

The light guide member 160 is disposed between the LED 134 and the light guide plate 135. The light guide member 160 is formed of a transparent silicone resin and is in contact with the light guide plate 135, the LED 134, the guide panel 142, and the lower cover 140. As shown in FIG. 3, the light guiding member 160 extends in a rectangular shape from one side of the light guide plate 135 to the other side, and the LED 135 is inserted into the surface facing the LED substrate 132 when assembled. A plurality of holes 165 are formed. Of course, the light guide member 160 may be partially formed only in the region where the LED 135 is disposed, not extending in a rectangular shape from one side of the light guide plate 135 to the other side.

As the light guide member 160 is disposed to be in contact with the light guide plate 135, the LED 134, the guide panel 142, and the lower cover 140, a space inside the backlight is removed to emit light from the LED 134 to form a liquid crystal panel. The light efficiency supplied to 110 is improved because of the following reasons.

When the light guide member 160 is not formed, a space is provided between the LED 134 and the light guide plate 135 as well as between the LED 134 and the lower cover 14 and between the LED 134 and the upper cover 146. There is an air layer in this space.

Therefore, when the light emitted from the LED 134 is incident through the light incident surface of the light guide plate 135, the light emitted from the LED 134 first propagates into the air layer and then enters the light guide plate 135. The encapsulant surrounding the light emitting layer of the LED 134 mainly uses a silicone-based epoxy, which has a refractive index of about 1.42. Therefore, when the light emitted from the LED 134 is incident on the air layer, the light is refracted by the refractive index difference at the interface between the encapsulant having a refractive index of about 1.42 and the air layer having the refractive index of 1, thereby changing the propagation direction of the light. Therefore, some of the light emitted from the LED 134 does not enter the light incident surface of the light guide plate 135 but propagates in the other direction, so that light loss occurs. In addition, when light is incident on the light guide plate 134 made of PMMA having a refractive index of about 1.49 in the air layer having a refractive index of 1, light is incident on the light incident surface of the light guide plate 134 due to a difference in refractive index. The light incident plate 134 is incident on the upper surface of the light emitting plate 134 below the critical angle, and light leaks to the area near the light incident surface.

However, in the present invention, since the light guide member 160 is provided between the LED 134 and the light guide plate 135, the space between the LED 134 and the light guide plate 135 is eliminated, and thus the LED 134 and the light guide plate 135 are removed. The air layer is removed between the layers to prevent light loss due to refraction at the interface of the air layer.

Since the silicone-based resin forming the light guiding member 160 has a refractive index of about 1.42, the difference in refractive index between the LED 134 and the encapsulant epoxy is virtually reduced, which is much reduced compared to the difference between the refractive index of air and epoxy. Therefore, when the light emitted from the LED 134 is incident on the light guide member 160, the angle of refraction is much reduced compared to the air layer, thereby minimizing light loss.

In addition, since the refractive index 1.42 of the light guide member 160 is almost similar to the refractive index 1.49 of the light guide plate 135, the light guide plate 135 is refracted when light is incident on the light incident surface through the light guide member 160. As a result, light is incident on the upper surface of the light guide plate 134 at a critical angle or less, thereby preventing the light guide plate 134 from leaking light to a region near the light incident surface.

In addition, the light guide member 160 acts as a heat insulating material. That is, heat generated when light is emitted from the LED 134 blocks the light guide plate 135 from being transmitted to the light incident surface by the light guide member 160. Therefore, it is possible to prevent the light incident surface of the light guide plate 135 from being deformed by the heat generated by the LED 134.

On the other hand, the light guide member 160 serves to assemble the LED 134 and the light guide plate 135 firmly. The light guide member 160 made of a silicone-based resin contacts the LED 134, the light guide plate 135, the lower cover 140, and the guide panel 142 in the backlight, and firmly connects the LED 134 and the light guide plate 135. Fix it. Therefore, even when an impact is applied from the outside, the LED 134 and the light guide plate 135 are not deviated from the original position by the light guide member 160. In addition, since the light guiding member 160 has a good shock absorbing force and the light guiding member 160 contacts the LED 134, the light guide plate 135, the lower cover 140, and the guide panel 142 inside the backlight, Even when an impact is applied, the shock is absorbed by the light guide member 160, thereby preventing the components such as the LED 134 and the light guide plate 135 from being damaged by the shock.

The reflective layer 164 is formed on a surface of the light guide member 160 that contacts the guide panel 142. The reflective layer 164 reflects the light emitted from the LED 134 and incident on the upper surface of the light guide member 160 to be incident on the light guide plate 135. The reflective layer 164 is made of metal having a high reflectance such as silver or aluminum. Can be.

In addition, an extension part 163 having a predetermined thickness is formed on a lower surface of the light guide member 160, and is inserted between the reflector plate 136 and the lower cover 140 when the backlight is assembled. Accordingly, the reflecting plate 136 is in close contact with the lower surface of the light guide plate 135 by the extension part 163, and the reflecting plate 136 does not peel off from the lower surface of the light guide plate 135 even when an impact is applied to the outside. The reflection efficiency of the light incident on the lower surface is not lowered.

As described above, in the present invention, by providing a light guide member made of a silicone-based resin between the LED and the light guide plate, heat generated from the LED is transmitted to the light guide plate, thereby preventing the light guide plate from being deformed, and firmly fixing the LED and the light guide plate to external impact. As a result, the LED and the light guide plate can be prevented from being damaged or its assembly from becoming defective.

On the other hand, the above detailed description describes the present invention as a specific structure, but the present invention is not limited to this specific structure. If the LED is disposed on the side of the light guide plate and the light guide member is disposed therebetween, it may be applied to the backlight of any structure. For example, the present invention may be applicable to a structure in which a plurality of LEDs are disposed on both side surfaces of the light guide plate, and may be applied to a backlight including various types of guide panels, a lower cover, and an upper cover.

In other words, other examples or modifications of the present invention can be easily created by anyone in the technical field to which the liquid crystal display device using the basic concept of the present invention belongs.

110: liquid crystal panel 132: LED substrate
134: LED 135: light guide plate
136: reflector 140: lower cover
142: guide panel 160: light guide member
162: hole 163: extension
164: reflective layer

Claims (8)

A plurality of LEDs emitting light; And
A light guide plate guiding light incident from the LED facing the LED;
And a light guide member disposed between the LED and the light guide plate to block heat generated from the LED and guide light emitted from the LED to the light guide plate. The method of claim 1,
An LED substrate on which the LED is mounted;
A reflective layer disposed on the light guide member; And
And a reflector disposed under the light guide plate to reflect light incident on the lower surface of the light guide plate. The backlight of claim 2, wherein a part of the light guide member extends to a lower surface of the reflecting plate. The backlight of claim 1, wherein the light guide member is made of a silicone-based resin. A liquid crystal panel for implementing an image;
A backlight unit including a plurality of LEDs emitting light, and a light guide plate for guiding light emitted from the LED to the liquid crystal panel facing the LEDs;
A guide panel supporting the liquid crystal panel;
A lower cover and an upper cover fastened to the guide panel to assemble the liquid crystal panel and the backlight; And
And a light guide member disposed between the LED and the light guide plate to block heat generated from the LED in contact with the LED, the light guide plate, the guide panel, and the lower cover, and guide light emitted from the LED to the light guide plate. The method of claim 5, wherein the backlight,
An LED substrate on which the LED is mounted;
A reflective layer disposed on the light guide member; And
And a reflector disposed under the light guide plate to reflect light incident on the lower surface of the light guide plate. The liquid crystal display of claim 6, wherein the light guide member further includes an extension part inserted between the lower cover and the reflector to fix the reflector to the lower surface of the light guide wave. The liquid crystal display of claim 5, wherein the light guide member is made of a silicone resin.

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