KR100806709B1 - Liquid crystal display device having front light unit - Google Patents

Abstract

An LCD(Liquid Crystal Display) having a front light unit is provided to implement a light guide plate in a film form by configuring the light guide plate so as to be thinner than a light source, thereby manufacturing the thinner LCD. A light source(60) emits light. A lens(50) is disposed in a side of the light source and enables the light, emitted from the light source, to be applied within it, reflected and then emitted to the outside. A light guide plate(20) is formed with a thickness smaller than a thickness of the light source, and coupled with the lens. The light guide plate receives the light emitted through the lens, and emits the light to a surface light source backwardly. An LC(Liquid Crystal) panel(10) is disposed in the rear of the light guide plate, and displays images by LC material arranged within it. A reflection sheet(30) is disposed in the rear of the LC panel, and reflects the light passing through the LC panel to the LC panel.

Description

Liquid Crystal Display Device Having Front Light Unit

1 is a cross-sectional view showing the structure of a liquid crystal display device having a general front light unit as a conventional technology.

2 is an exploded perspective view of a liquid crystal display device having a front light unit according to an embodiment of the present invention;

3 is a cross-sectional view of the liquid crystal display of FIG. 2.

FIG. 4A is an enlarged view of a lens portion of the front light unit of the LCD of FIG. 2, which is in contact with a light source; FIG.

FIG. 4B is an enlarged view of a contact portion between a lens and a light guide plate of the front light unit of the LCD of FIG. 2; FIG.

FIG. 5A is a view similar to FIG. 4A and illustrating another embodiment of a lens portion in contact with a light source among the frontlight units of the LCD of FIG. 2.

FIG. 5B is a view similar to FIG. 4B, showing another embodiment of the contact portion between the lens and the light guide plate of the front light unit of the liquid crystal display of FIG. 2.

6 is a cross-sectional view of a liquid crystal display device having a front light unit according to another embodiment of the present invention.

FIG. 7 is an enlarged partial perspective view of a main part of the light guide plate of the front light unit of FIG. 6; FIG.

8 is a cross-sectional view illustrating main parts of the light guide plate of FIG. 7.

9A is a sectional view showing the principal parts of another embodiment of a reflective printing layer formed on a light guide plate;

FIG. 9B is a view similar to FIG. 9A, illustrating a sectional view of the principal portion of still another embodiment of the reflective printed layer formed on the light guide plate; FIG.

Fig. 10A is a sectional view showing the principal parts of still another embodiment of a reflective printing layer formed on the light guide plate of the front light unit.

FIG. 10B is a view similar to FIG. 10A, with the main section showing another embodiment of the reflective printing layer formed on the light guide plate of the front light unit.

11 is a sectional view showing the principal parts of still another embodiment of a reflective printing layer formed on the light guide plate of the front light unit;

12A shows another embodiment of a lens of the frontlight unit according to the invention.

FIG. 12B is a view similar to FIG. 12A, showing another embodiment of a lens of the frontlight unit; FIG.

FIG. 12C is a view similar to FIG. 12A, showing another embodiment of a lens of the frontlight unit.

13 is an exploded perspective view showing another embodiment of a liquid crystal display device having a front light unit according to the present invention;

FIG. 14 is an exploded perspective view illustrating some components of the liquid crystal display of FIG. 13 in combination.

15 is a cross-sectional view illustrating main parts of the liquid crystal display of FIG. 13.

FIG. 16 is a perspective view of a coupled state of the liquid crystal display of FIG. 13, illustrating that the liquid crystal display of the present invention has flexible characteristics. FIG.

Explanation of symbols on the main parts of the drawings

10 liquid crystal panel 20 light guide plate

21: exit surface 22: reflective surface

23: bonding hole 30: reflective sheet

40: Outsole 50: Lens

51: first lens unit 52: second lens unit

54, 55 prism shape 56, 57 lenticular shape

60: light source 71, 72: cover

123: emission characteristics change layer 124: reflective printing layer

125: reflection pattern

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having a front light unit, and more particularly, to a lightweight light unit that provides a surface light source to a liquid crystal panel in front of the liquid crystal panel, and is easy to implement light weight, and is flexible. The present invention relates to a liquid crystal display device having a front light unit of one feature.

As is well known, Liquid Crystal Display (LCD) is applied to a monitor of a computer, a display panel of a mobile phone, and the like, and its application and frequency of use are increased due to its low power consumption, thinness, and small size. have.

Such a liquid crystal display device converts an arrangement of liquid crystal materials so that a specific image is expressed when light is supplied and emitted to the outside, and a back light unit (BLU) or a front light according to a method of providing light. The front light unit (FLU) is selectively adopted and applied.

In this case, the liquid crystal display device to which the backlight unit is applied has a disadvantage that the size and weight of the backlight causes a large size and a high weight of the product, and in particular, excessive power is consumed by supplying power for emitting the backlight.

Therefore, a liquid crystal display device to which the front light unit is applied has been developed and used as a technique for solving the above disadvantages.

1 of the accompanying drawings shows a main configuration of a conventional liquid crystal display device to which the front light unit is applied, the conventional liquid crystal display device in front (upper side of the drawing) of the liquid crystal panel 1 injecting a liquid crystal material therein The light guide plate 2 which receives external light and transmits it to the liquid crystal panel 1 as a surface light source is installed, and the reflective sheet 3 for reflecting the received light is disposed behind the liquid crystal panel 1. Is done.

Reference numeral 4 in the drawings is an outsole that is installed in front of the light guide plate 2 to protect the light guide plate 2.

In the liquid crystal display device configured as described above, when external natural light is incident on the reflective liquid crystal panel 1 through the outer window 4 and the light guide plate 2, the incident light is reflected on the reflective sheet 3 disposed below the liquid crystal panel 1. The light emitted to the outside is reflected to the outside, and the light emitted to the outside allows the desired image to be observed by the user's naked eye by the arrangement (for representing the image) of the liquid crystal material of the liquid crystal panel 1.

In addition, in the liquid crystal display, a separate light source 5 is installed at one side of the light guide plate 2 to provide light in a time / space in which external natural light is not received to form a front light unit.

Since the liquid crystal display device having the front light unit as described above uses natural light and the light source 5 simultaneously or selectively, the liquid crystal display device may have a small advantage as compared to a backlight surface light source device which is conventionally used.

In addition, a drive circuit 6 for supplying an electric signal to the liquid crystal panel 1 and driving the light source 5 is provided below the reflective sheet 3.

In the front light unit of the liquid crystal display device configured as described above, in the coupling relationship between the light guide plate 2 and the light source 5, the thickness of the light guide plate 2 to which the light source 5 is coupled is at least larger than the size of the light source 3. Or remain the same so that most of the light emitted from the light source 5 can be supplied to the light guide plate 2.

This is because when the thickness of the light source 3 is greater than the thickness of the light guide plate 2, the light emitted from the light source portion in the section beyond the thickness of the light guide plate 2 is lost to the external space of the light guide plate. The size of the light source used for is known as a thickness of at least 20mm in the case of CCFL, 0.4mm in the case of the light emitting diode device.

Therefore, the thickness of the light guide plate forming the surface light source of most frontlight units is generally made to be at least 0.4 mm or more.

Such a thickness limitation of the light guide plate causes a limitation in the thinning of the front light unit, making it difficult to implement the thinning of the liquid crystal display device, which causes a disadvantage in that the product cannot gradually respond to the trend of thinning.

In addition, in the case of a flexible liquid crystal display device such as an e-paper, which is recently developed, it is difficult to employ a current surface light source, and thus has a limitation of displaying a limited color.

In order to use it as a surface light source of the flexible liquid crystal display device, it is necessary to configure a product to satisfy characteristics such as ultra-thinness that the current front light unit cannot have as well as the front light unit itself has a bendability, but it does not satisfy this problem. Problems arise.

In addition, since the amount of emitted light is very small, the surface light emission luminance of the front light unit is also lowered, resulting in a problem that the brightness and clarity of the image expressed on the liquid crystal display device are lowered.

The present invention has been proposed to solve the above problems, the light guide plate which is emitted from the light source to the surface-emitting light guide plate to implement a slim configuration of the film to enable the thinning of the product, the slim frontlight implemented It is an object of the present invention to provide a liquid crystal display device having a front light unit capable of emitting high brightness light through the unit.

The present invention for achieving the above object, and a light source for emitting light; A lens disposed at one side of the light source to allow light emitted from the light source to be incident therein and then be reflected and emitted to the outside; A light guide plate which is formed to a thickness smaller than the thickness of the light source, is coupled to the lens, and receives light emitted through the lens and exits the surface light source to the rear; A liquid crystal panel disposed on a rear surface of the light guide plate and configured to display an image by an external electricity and a liquid crystal material arranged inside; Provided is a liquid crystal display device having a front light unit disposed on a rear surface of the liquid crystal panel and including a reflective sheet reflecting light passing through the liquid crystal panel toward the liquid crystal panel.

According to the present invention, since the light guide plate can be made thinner than the light source, the light guide plate can be realized in the form of a film, and thus the liquid crystal display device can be made thinner.

Hereinafter, exemplary embodiments of a liquid crystal display device having a front light unit according to the present invention will be described in detail with reference to the accompanying drawings.

First, referring to FIGS. 2 and 3, a liquid crystal display according to the present invention includes a light guide having a thickness smaller than that of the liquid crystal panel 10, the light source 60, the lens 50, and the light source 60. It has a basic configuration composed of the plate 20.

The liquid crystal panel 10 is injected with a liquid crystal material therein, and is connected to an electric / electronic circuit for forming a desired image by changing the arrangement of the liquid crystal material, and for receiving signals and power of the electric / electronic circuit. It is well known that electrodes, wirings, etc. are formed.

The light source 60 is applied to a lamp or a device that emits light by receiving an external electric power, and most commonly as a cold cathode fluorescent lamp (CCFL) or a light-emitting diode (LED). Selected and configured.

In this case, it is preferable to select and apply a light emitting diode to the light source, which, as is well known, is driven by less power consumption than a cold cathode fluorescent lamp, and has excellent electrical characteristics when configuring an electric circuit. Because.

The lens 50 is configured to receive light emitted from the light source 60 (indicated by an arrow in the drawing) and to emit the received light toward the light guide plate 20.

At this time, since the light guide plate 20 is formed to have a thickness thinner than the size of the light source 60, the light supplied from the light source 60 is reflected through the lens 50 and guided to the light guide plate 20.

In order to implement such a configuration, the lens 50 has an outer surface except for a point where the light guide plate 20 and the light source 60 are coupled to and contact with each other, and the reflective surface 50a is formed on the outer surface of the lens. The reflective film may be combined to form a reflective film layer or may be formed by printing (coating) a reflective paint. In addition, the reflective surface 50a may be applied in various configurations, such as by forming different media of the outer surface of the lens 50.

The combined state of the lens 50 and the light source 60 is that light is emitted in one direction when the light source 60 is applied as a light emitting diode (LED), so that the light source 60 is a side surface of the lens 50. It is configured to be coupled to.

The light guide plate 20 is formed to a thickness smaller than the thickness of the light source 60 is coupled to the lens 50, for this purpose, the light guide plate 20 is in the form of a polyester film, a polycarbonate film and the like excellent optical properties It is produced, the thickness can be formed to a thickness of about 0.005 ~ 0.45mm.

The light guide plate 20 forms one surface (lower surface of the drawing) as an emission surface 21 from which light is emitted in order to emit light from the light source 60 to one surface to improve the brightness of the light, and the rear surface (upper surface of the drawing). ) Is formed by the reflective surface 22.

In particular, the reflecting surface 22 is a surface for reflecting light that is not supplied to the light emitting surface 60 and does not proceed to the light emitting surface 21 and proceeds to the light emitting surface 21 side, which is emitted to the light emitting surface 21. Outsole 40 for diffusing and condensing light is selectively formed, and a reflective sheet 30 for reflecting light passing through the liquid crystal panel 10 toward the liquid crystal panel 10 is formed at the rear of the liquid crystal panel 10. do.

The outsole 40 is made of a polymer resin material having a high transmittance when the external light is received or the light reflected by the reflective sheet 11 is emitted and / or a special tempered glass having excellent impact properties suitable for optics. desirable.

For example, the outsole 40 may be made of a transparent material made of a polymer resin material such as polymethyl methacrylate (PMMA) or polycarbonate (PC) having excellent light transparency and excellent durability. Can be.

On the other hand, the light guide plate 20 is coupled to the end portion of the lens 50 is inserted into a predetermined length, the light guide plate 20 to the inner surface of the lens 50 to maintain the state coupled to the lens 50 Coupling protrusions 53a and 53b inserted into and coupled to the coupling hole 23 of the light guide plate 20 are protruded.

The lens 50 is composed of a first lens unit 51 and a second lens unit 52 divided into upper and lower sides, and the coupling is coupled to the lower surface and the upper surface of the first and second lens units 51 and 52. The protrusions 53a and 53b are projected to face each other so that the first and second lens parts 51 and 52 are coupled to the upper and lower sides of the light guide plate 20, respectively, so that the lens 50 and the light guide plate 20 are coupled to each other. This can be done. Of course, the lens 50 and the light guide plate 20 may be combined in other ways.

For example, when the lens 50 is integrally manufactured, the light guide plate 20 is inserted into the lens 50, and then a separate coupling pin is penetrated through the lens 50 and the light guide plate 20, or combined. The lens 50 and the light guide plate 20 may be fixed to each other by using a separate clamping member.

In addition, in order to stably fix the outsole 40, the liquid crystal panel 10, and the reflective sheet 30 to the light guide plate 20, the lens 50, the outsole 40, the liquid crystal panel 10, and the reflective sheet 30 are fixed. ), Covers 71 and 72 may be coupled, respectively.

4 shows a modification of the lens 50, wherein the lens 50 of this embodiment has an inclined surface 54 recessed inwardly on one side of the lens 50, strictly speaking, on the opposite side of the portion combined with the light guide plate 20. ) Is formed and a serration 54a (serration) having a predetermined pattern, for example, a triangular prism pattern, is formed on the inclined surface 54.

As described above, when the inclined surface is formed on the lens 50 and the serration 54a having a predetermined pattern is formed on the inclined surface, the light source 60 is incident on the lens 50 even though the light source 60 is provided on the side. Light is reflected toward the light guide plate 20 by being reflected by the serration 54a of the inclined surface 54.

In addition, FIG. 5A illustrates an example of a form of a contact portion between the lens 50 and the light guide plate 20, wherein the lens 50 is emitted from the light source 60 and reflected from the inside of the lens 50. The prism shape 55 is formed on the surface of the lens 50 (the contact point between the surface light source member and the lens) facing the incident surface of the light guide plate 20 so that the light guide plate 20 is incident and collected. The prism shape part 55 has a structure in which a plurality of prism shapes protruding from the lens 50 toward the light guide plate 20 are arranged.

Of course, the prism shape 55 may be formed only on the lens 50 as in this embodiment, but the prism shape 56 and 26 are formed on both the lens 50 and the light guide plate 20 as shown in FIG. 5B. ) May be formed in a shape corresponding to each other.

In addition, as shown in FIG. 5C, the surface (surface) of the lens 50 opposite to the incident surface of the light guide plate 20 in order to allow the light reflected inside the lens 50 to be incident and diffused into the light guide plate 20. A lenticular shape 25 having a hemispherical lens shape may be formed at the contact point between the light source member and the lens.

The liquid crystal display device having the front light unit configured as described above is configured by the light guide plate 20 manufactured in the form of a film so that the overall thickness is slim (meaning a thinned configuration), except for the liquid crystal panel 10 or the liquid crystal panel ( 10) If it is possible to manufacture itself flexible, it is possible that the entire liquid crystal display has a flexible characteristic.

In addition, the prism-shaped portions 54 and 55 or the lenticular-shaped portions 56 and 57 formed in the lens 50 improve the light condensing performance or the diffusing performance of the incident light, so that the light is emitted from the lens 50 and the light guide plate ( 20 to ensure high brightness when supplied.

6 to 8 show another embodiment of the liquid crystal display device having the front light unit according to the present invention. The liquid crystal display device having the front light unit according to this embodiment is the emission surface 121 of the light guide plate 120. Referring to FIG. The configuration formed by forming the emission characteristic change layer 123 and the reflective print layer 124 on the and reflecting surface 122 is presented.

The emission characteristic change layer 123 is printed to protrude on the exit surface 121 of the light guide plate 120, and the exit characteristic change layer 123 converts a path of light emitted through the exit surface 121. This serves to further spread.

The reflective print layer 124 reflects the light traveling forward of the light guided by the lens 50 into the light guide plate 120 so that more light can be supplied toward the liquid crystal panel 10. .

The reflective printed layer 124 may be formed by printing (coating) a reflective paint on the reflective surface 122 of the light guide plate 120 or by forming a reflective pattern on the reflective surface 122. The reflective pattern constituting the reflective printed layer 124 may be formed in various forms. For example, as shown in FIG. 8, a triangular diffusion protrusion 125 may be continuously arranged on the reflective surface 122. As illustrated in FIG. 9A, a semicircle protruding from the reflective surface 122 may be used. It may be formed of a reflective projection 125a of the shape, or may be formed of a reflective projection 125b having a rectangular shape as shown in FIG. 9B.

In addition, as shown in FIG. 9B, the reflective patterns 125c formed on the reflective surface 122 of the light guide plate 120 have a gentle inclination angle α at a portion close to the lens 50, and the opposite side is urgent. It may be configured to have a triangular form with an inclination angle β.

The reflection patterns 125, 125a, 125b, and 125c reflect the light supplied from the light source 60 to the emission surface 121, thereby increasing the amount of light reflected from the light source 60 to increase the emission efficiency. It works to improve.

10A and 10B illustrate another embodiment of the reflective print layer 124 formed on the reflective surface 122 of the light guide plate 120. The reflective patterns 125d and 125e constituting the reflective print layer 124 are shown in FIG. Is formed of a projection of a triangular prism, and has a feature that the density is arranged higher away from the light source (60).

This is due to the fact that when the light generated from the light source 60 (see FIG. 2) proceeds inside the light guide plate 120, the luminance is lowered by the resistance of the medium as it moves away from the light source 60. This is to increase the amount of reflection on the far side and to reduce the amount of reflection on the side near the light source so that the luminance of the light guide plate 120 can be uniformly obtained.

As described above, the configuration for applying the density differently is set by adjusting the arrangement interval of the reflective pattern 125d as the reflective element (A1> A2) as shown in FIG. 10A, or the reflective pattern 125e as the reflective element as shown in FIG. 10B. ) By adjusting the size and setting (B1 < B2).

In addition, as shown in FIG. 11, when the reflection pattern 125f of the light guide plate 120 assumes the width formed at the reflection surface 122 as n1 and the protruding height as n2, n1> n2 and n2> n1 It is suggested that the structure be configured to have a size proportion of n2 = n1.

In the case of n1> n2, the size is proportional to increase the amount of reflection of light.In the case of n2> n1, the amount of reflection of light is reduced while the degree of condensing of the reflected light toward the exit surface is improved.n1 = n2 In one case, both the amount of reflection and the degree of condensing can be satisfied.

Therefore, the size ratio of the width and the height of the reflective pattern 125f is selected according to the characteristics of each section of the light guide plate 120, and selects the configuration of n1> n2 toward the section where the reflection amount is insufficient (the section of the light source and the far distance). Is appropriate, while the light is collected in a low concentration range (corner section where the light spreads outward), the composition of n2> n1 is selected.In the section where the amount of reflection and the concentration of light are balanced, the configuration of n1 = n2 is selected. By doing this, the light uniformity can be further improved.

The front light unit configured as described above has a small period of formation of the reflective element 81 for forcibly reflecting light in a section close to the light source 60, that is, in a section having low density of the reflective patterns 125d, 125e, and 125f. On the contrary, since the formation period of the reflection patterns 125d, 125e, and 125f forcibly reflecting the light is large in the region where the reflection patterns 125d, 125e, and 125f have high density, the amount of reflection of the light increases.

Accordingly, when the distance between the light source 60 and the light source 60 is lowered from the luminance and the phenomenon that the amount of reflection is increased on the reflective surface 122 of the far section from the light source 60 is conflicted, the light guide plate 120 is uniform in all sections. A quantity of light is emitted.

In addition, in order to maintain uniformity when using such a pattern, the exit surface of the light guide plate 120 is preferably formed of a matte surface.

This action solves the disadvantage that the image expressed in the liquid crystal display is partially different in brightness so that a clear color cannot be expressed, thereby making it possible to identify a better image.

12A to 12C show various embodiments of a lens constituting the frontlight unit of the liquid crystal display according to the present invention.

The lens 50A shown in Fig. 12A is constructed by excluding either the upper side or the lower side (excluding the lower side in the drawing) in the configuration of the lens 50 as in the first embodiment described above.

In addition, the lens 50B shown in FIG. 12B excludes any one of the upper and lower lenses 50, and the shape thereof is in contact with the upper surface of the light guide plate 20 at the end adjacent to the light source 60. The inclined surface 59a is formed until.

The lens 50C of FIG. 12C has a structure in which a groove 59b in which one side is recessed inward is formed in the basic form of the lens 50A as shown in FIG. 12A.

If one of the upper and lower sides is excluded from the configuration of the lenses 50A, 50B, and 50C, the lenses 50A, 50B, and 50C can be manufactured at a lower cost. In addition, the inclined surface (59a) to reflect the light emitted from the light source 60 in the fastest path to improve the supply characteristics of the light. In addition, the groove 59b induces diffuse reflection of light emitted from the light source 60 to improve the brightness of light entering the light guide plate 20. In particular, the groove 59b may be formed in the shape of a hemisphere, a semicircle, or a polygon in addition to the shape of a triangle as shown in the drawing.

13 to 17 show another embodiment of a liquid crystal display device having a front light unit according to the present invention.

The liquid crystal display of this embodiment provides a flexible mold frame 270 that can more firmly fix the lens 250, the light guide plate 220, and the liquid crystal panel 210 of the front light unit.

That is, the liquid crystal display of this embodiment includes a light source (not shown), a lens 250 into which light is incident from the light source, a light guide plate 220, an outer window 240, a liquid crystal panel 210, and a reflective sheet. 230 and a mold frame 270. The lens 250 is divided into a first lens unit 251 and a second lens unit 252.

The mold frame 270 is made of synthetic and natural resin materials such as soft silicone, polyester resin, etc. in order to have flexible characteristics.

The mold frame 270 is provided outside the light guide plate 220 and is coupled to the lens 250. More specifically, the mold frame 270 has a 'c' shaped frame structure in which a flange 272 which contacts the outer circumferential surface of the light guide plate 220 which is a surface light source member is formed along the circumference. In addition, the open both ends of the mold frame 270 is inserted into the lens 250 and coupled.

Here, coupling holes 271 are formed at both ends of the mold frame 270 inserted into the lens 250 so that the coupling holes 271 penetrate therethrough, and the mold is formed on the inner side of the first and second lens parts 251 and 252. Coupling protrusions 253 and 254 are inserted into and coupled to the coupling holes 271 of the frame 270. At the same time, a coupling hole 224 is formed at an end of the light guide plate 220 inserted into the lens 250, and the first and second lens parts 251 and 252 corresponding to the point where the coupling hole 224 is formed. Coupling protrusions 255 and 256 are inserted into the coupling hole 224 to support the light guide plate 220 to be fixed to the inner side of the cover.

The coupling protrusions 253, 254, 255, and 256 may be formed on both sides of the first and second lens units 251 and 252 as described above, but differently from among the first and second lens units 251 and 252. It may be formed only on either side.

In addition, the flange 272 of the mold frame 270 extends in the front and rear directions (up and down on the drawing) around the mold frame 270, and not only the light guide plate 220 but also the light guide plate 220. The liquid crystal panel 210 and the reflective sheet 230 positioned on the rear surface of the outsole 240 and the light guide plate 220 mounted on the front surface may also be positioned inside thereof to support the outer circumferential portions thereof.

When the liquid crystal display is configured as described above, since the mold frame 270 itself including the light guide plate 220 has a flexible characteristic, the front light unit itself has a flexible characteristic as shown in FIG. In addition, when manufactured to have flexible characteristics, the entire liquid crystal display may have flexible characteristics.

As described above, according to the present invention, since the light guide plate may be configured to be thinner than the light source, the light guide plate may be realized in the form of a film, and thus, the liquid crystal display device may be manufactured to be thinner.

Claims (8)

A light source for emitting light; A lens disposed at one side of the light source to allow light emitted from the light source to be incident therein and then be reflected and emitted to the outside; A light guide plate which is formed to a thickness smaller than the thickness of the light source, is coupled to the lens, and receives light emitted through the lens and exits the surface light source to the rear; A liquid crystal panel disposed on a rear surface of the light guide plate and configured to display an image by an external electricity and a liquid crystal material arranged inside; And a front light unit disposed on a rear surface of the liquid crystal panel and including a reflective sheet reflecting light passing through the liquid crystal panel toward the liquid crystal panel. The liquid crystal display device according to claim 1, further comprising a transparent outer window disposed in front of the light guide plate. The liquid crystal display of claim 1 or 2, further comprising a mold frame having both end portions coupled to the lens and the outer circumferential portion of the light guide plate being seated and supported. The liquid crystal display device according to claim 1, wherein a reflective printing layer is formed on a reflective surface in front of the light guide plate. The liquid crystal display device according to claim 4, wherein the reflective printed layer is formed by a plurality of reflective patterns having a predetermined shape. 6. The liquid crystal display device according to claim 5, wherein the reflective pattern has a higher density at a portion farther than a portion close to the light source. The liquid crystal display device according to claim 1, wherein an emission characteristic change layer is formed on an emission surface behind the light guide plate. The liquid crystal display of claim 1, wherein the lens is divided into a first lens unit and a second lens unit.

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