KR20030082251A - Liquid crystal display apparatus - Google Patents

Abstract

PURPOSE: A liquid crystal display is provided to increase luminance of the liquid crystal display and minimize the overall size and weight of the liquid crystal display. CONSTITUTION: A liquid crystal display(600) includes a light source(100) for generating the first beam, a light guide(200), a reflector(300), and a liquid crystal display panel(500). The light guide is composed of an incident face to which the light beam is inputted, the first projection face for guiding the first beam to project the second beam, and the second projection face for projecting the third beam inputted through the first projection face. The reflector includes a support layer, a light-condensing layer having a plurality of protrusions, a reflection layer covering the overall surface of the light-condensing layer, and a protection layer for protecting the reflection layer. The reflector reflects the second beam to provide the third beam having improved luminance to the light guide. The liquid crystal display panel receives the third beam from the light guide to display an image.

Description

Liquid crystal display device {LIQUID CRYSTAL DISPLAY APPARATUS}

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device that can realize thinner and lighter weight while increasing front brightness.

Recently, information processing devices have been rapidly developed to have various forms and functions, and faster information processing speed. Such information processing apparatuses require display devices for displaying processed information.

A CRT monitor is mainly used as a display device. Recently, a liquid crystal display device having a light weight, a small size, and a small space has been developed and widely used with the generalization of a portable device.

In general, a liquid crystal display device applies a voltage to a specific molecular array of liquid crystal to convert it into another molecular array, and displays information using modulation of light by the molecular array. The liquid crystal display device is a passive optical device that does not emit light by itself, and thus uses a backlight assembly attached to the rear surface of the liquid crystal display panel. Recently, various structures have been developed for slimming and lightening to secure the competitiveness of the product. In particular, in view of the fact that the liquid crystal display device is mainly used in portable computers and the like, weight reduction is treated more heavily.

In such a liquid crystal display device, the role and function of the backlight assembly are becoming more and more important issues. The size and light efficiency of the liquid crystal display device vary greatly according to the structure of the backlight assembly, and the mechanical and optical characteristics of the overall liquid crystal display device are increased. This is because the property is affected.

1 is an exploded perspective view showing a conventional liquid crystal display device.

Referring to FIG. 1, the liquid crystal display device 50 includes a backlight assembly 30 generating a first light and an upper side of the backlight assembly 30, and receives the first light to display an image. A panel 40.

The backlight assembly 30 includes a lamp unit 10, a light guide plate 20, a reflection plate 22, and a plurality of optical sheets 32, 34, 36, and 38 provided on one side of the lamp unit 10. .

Specifically, the lamp unit 10 includes a lamp 12 for generating light and a lamp reflector 14 surrounding the lamp 12. Light generated from the lamp 12 is incident to the light guide plate 20 side. The lamp reflector 14 reflects the light generated from the lamp 12 toward the light guide plate 20 to increase the amount of light incident on the light guide plate 20.

The light guide plate 20 is provided at one side of the lamp unit 10, and changes the path of the light emitted from the lamp unit 10 to guide the liquid crystal display panel 40. The lower portion of the light guide plate 20 is provided with a reflector 22 for reflecting light leaked from the light guide plate 20 back to the light guide plate 20.

On the other hand, the plurality of optical sheets 32, 34, 36, 38 are provided on the light guide plate 20 to improve the efficiency of the light emitted from the light guide plate 20. The plurality of optical sheets 32, 34, 36, and 38 may include a diffusion sheet 32, a first prism sheet 34, a second prism sheet 36, and a protective sheet 38.

Specifically, the diffusion sheet 32 disperses the light incident from the light guide plate 20 to prevent the light emitted from the diffusion sheet 32 from being partially concentrated. A plurality of triangular prisms are formed on the upper surfaces of each of the first and second prism sheets 34 and 36, thereby narrowing the viewing angle of the fourth light diffused by the diffusion sheet 32 to improve front luminance. The first and second prism sheets 34 and 36 are disposed such that the prisms formed on the first and second prism sheets 34 and 36 are perpendicular to each other. The protective sheet 38 protects the surface of the second prism sheet 36 and prevents moire and rainbow caused by the first and second prism sheets 34 and 36.

As such, the light generated from the lamp 12 and passing through the plurality of optical sheets 32, 34, 36, and 38 is displayed by the liquid crystal display panel 40 as an image.

The above-described conventional liquid crystal display device 50 includes a plurality of sheets 32, 34, 36, and 38 for diffusing and condensing light guided from the light guide plate 20 to increase luminance in the front direction. . Such a structure can improve the display characteristics of the liquid crystal display device 50, but requires a plurality of sheets 32, 34, 36, 38 to do so. As a result, the assembly process of the liquid crystal display device 50 is complicated, and the overall size and weight thereof are increased.

Accordingly, an object of the present invention is to provide a liquid crystal display device which can realize thinner and lighter weight while increasing front brightness.

1 is a perspective view showing a conventional liquid crystal display device.

2 is a perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

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

4 and 5 are views showing in detail the reflector according to an embodiment of the present invention.

6 is a cross-sectional view showing the structure of a reflecting plate according to another embodiment of the present invention.

7 is a cross-sectional view showing the structure of a reflecting plate according to another embodiment of the present invention.

8A to 8C are diagrams for describing the shape of the reflector shown in FIG. 4.

FIG. 9 is a cross-sectional view of the light guide plate illustrated in FIG. 2 in detail.

FIG. 10 is a perspective view illustrating portion A of FIG. 9 in detail.

FIG. 11 is a view illustrating the rear surface of the light guide plate illustrated in FIG. 9 in detail.

12 is a view specifically showing a light path in the backlight assembly according to the present invention.

According to an aspect of the present invention, there is provided a liquid crystal display device comprising: a light source for generating first light, an incident surface on which the first light is incident, and a second light for guiding the first light to emit second light; A light guide plate having a first emission surface and a second emission surface facing the first emission surface and emitting a third light incident through the first emission surface, provided below the first emission surface of the light guide plate; a condensing layer having a plurality of protrusions protruding from a surface of the support layer and extending from a first end of the support layer to a second end opposite to the first end, c) the condensing A reflective layer covering the entire surface of the layer and provided with a uniform thickness on the light collecting layer, d) a protective layer laminated on the reflective layer to protect the reflective layer, and reflecting the second light to increase the front brightness. The received service of the third light to the third light from the reflector and the light guide panel to provide to the light guide panel comprises a liquid crystal display panel for displaying an image.

According to the present invention, the reflecting plate includes a plurality of protrusions having a triangular prism shape on the reflecting surface, thereby condensing the second light guided to the reflecting plate side by the light guide plate into third light having improved front luminance, and condensing The third light is reflected toward the liquid crystal display panel. Accordingly, the liquid crystal display device can not only increase the front brightness by the reflector, but also minimize the overall size and weight.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention.

2 is an exploded perspective view showing in detail a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 3 is a cross-sectional view showing the liquid crystal display shown in FIG. 2 in detail.

2 and 3, the liquid crystal display device 600 includes a liquid crystal display panel 500 for displaying an image and a backlight assembly 400 for supplying uniform light to the liquid crystal display panel 500. .

The liquid crystal display panel 500 includes a TFT substrate (not shown) on which a switching element and a pixel electrode are formed, a color filter substrate (not shown) on which an RGB pixel and a common electrode are formed, and between the TFT substrate and the color filter substrate. It includes a liquid crystal (not shown) located.

Meanwhile, the backlight assembly 400 may include a lamp unit 100 for generating a first light L1, a light guide plate 200 for guiding the first light L1, and a second light emitted from the light guide plate 200. It consists of the reflecting plate 300 which reflects L2.

The lamp unit 100 includes a lamp 120 and a lamp cover 140, and a cold cathode tube is mainly used for the lamp 120. The first light L1 is incident on the side surface of the light guide plate 200, that is, through the incident surface 210 provided with the lamp 120. The lamp cover 140 improves the efficiency of the first light L1 by reflecting the first light L1 radially generated from the lamp 120 toward the incident surface 210 of the light guide plate 200. Let's do it.

The light guide plate 200 is provided on one side of the lamp unit 100 and is a flat light guide plate having a uniform thickness to the other side positioned opposite to the one side. In this case, the light guide plate 200 may be a wedge-shaped light guide plate that becomes thinner from the one side toward the other side positioned opposite to the one side. The light guide plate 200 is generally high in strength and is not easily broken or deformed, and a light and transparent acrylic resin (polymethylmethacrylate: PMMA) series is used.

The light guide plate 200 is provided on the side where the lamp unit 100 is disposed to face the incident surface 210 to which the first light L1 is incident and the reflecting plate 300 to face the first light L1. To the first exit surface 220 and the first exit surface for exiting as the second light L2 traveling toward the reflector 300, and the third light L3 reflected by the reflector 300. ) Is provided to the liquid crystal display panel 500 side. Here, a plurality of light guide patterns 221 are formed on the first emission surface 220 to guide the first light L1 toward the reflecting plate 300. A detailed description of the light guide pattern 221 will be described later with reference to the drawings.

In the drawing, the reflector 300 is disposed below the light guide plate 200. In this case, a plurality of irregularities are formed on the surface of the reflecting plate 300 facing the first exit surface 220. Accordingly, the reflective plate 300 changes the second light L2 into the third light L3 having improved front luminance due to the plurality of irregularities and provides the light to the liquid crystal display panel 500.

Hereinafter, the structure of the reflector according to the present invention will be described in detail with reference to FIGS. 4 to 7.

4 and 5 are views showing in detail the structure of the reflector according to an embodiment of the present invention.

4 and 5, the reflective plate 300 is formed on the support layer 310, the support layer 310, and has a uniform thickness thereon, the light collecting layer 320 having a plurality of protrusions 325. The stacked reflective layer 330 and the reflective layer 330 are stacked on the reflective layer 330 to have a uniform thickness to protect the reflective layer 330.

Specifically, the support layer 310 is made of poly-ethylene terephthalate (PET) -based, and the light collecting layer 320 made of acrylic resin is coated on the support layer 310. The light collecting layer 320 is a layer in which a plurality of protrusions 325 having a triangular prism shape are formed.

Each of the plurality of protrusions 325 is inclined at a first inclined surface 321 inclined at a first angle A1 from the surface of the support layer 310 and at a second angle A2 from the surface of the support layer 310. The second inclined surface 322 is formed. The first end of the first inclined surface 321 is engaged with the second end of the second inclined surface 322 to form one first pitch 323. At this time, the first pitch 323 has a pointed shape.

On the other hand, it is preferable that the said 1st and 2nd angles A1 and A2 exist in the range of 30 degrees-45 degrees, respectively. It is also preferable that the first and second angles A1 and A2 are the same.

The reason for setting the first and second angles A1 and A2 in the range of 30 ° to 45 ° will be described later with reference to the drawings.

The reflective layer 330 is formed to have a uniform thickness on the light collecting layer 320. In this case, the reflective layer 330 is made of any one of aluminum (Al), aluminum oxide (Al ₂ O ₃ ) and silver (Ag), and is deposited on the light collecting layer 320 by a uniform thickness. In this case, since the reflective layer 330 is formed to have a uniform thickness on the light collecting layer 320, the reflective layer 330 has the same surface structure as the light collecting layer 320. That is, the reflective layer 330 is formed of the first reflective surface 331 inclined at the support layer 310 and the first angle A1, and the first reflective surface 331 inclined at the support layer 310 and the second angle A2. It consists of two reflective surfaces 332. At this time, the third end of the first reflective surface 331 and the fourth end of the second reflective surface 332 are engaged to form one second pitch 333, and the second pitch 333 is sharp. It has a shape.

The protective layer 340 may be formed of a PET-based transparent, low refractive index, or may be formed of indium tin oxide (ITO). Here, since the protective layer 340 has a uniform thickness on the reflective layer 330, the protective layer 340 has the same surface structure as the reflective layer 330.

As such, by forming the protective layer 340 on the reflective layer 330, the reflective layer 330 is prevented from being damaged by an impact from the outside. In addition, the protective layer 340 may be formed thick enough to protect the reflective layer 330. However, since the thickness of the liquid crystal display device is increased, it is preferable to maintain a certain thickness. .

As shown in FIG. 5, the plurality of protrusions 325 extend from one end of the reflecting plate 300 to the other end opposite to the one end. At this time, the plurality of protrusions 325 are each formed in succession in parallel with each other. Specifically, the plurality of protrusions 325 extend in the longitudinal direction of the lamp 120 to form a relationship in parallel with the lamp 120. Therefore, the first light L1 generated from the lamp 120 may contact the first and second reflective surfaces 331 and 332 of the protrusion 325 and be reflected toward the light guide plate 200.

6 is a view showing the structure of a reflector according to another embodiment of the present invention.

Referring to FIG. 6, the light collecting layer 320 includes a plurality of protrusions 326 having first and second slopes 321 and 322 formed on the support layer 310 and the first pitch 323 having a round shape. ) Is formed. In this case, the reflective layer 330 is provided on the condensing layer 320 with a uniform thickness, and the reflective layer 330 is formed of a first reflective surface 331, a second reflective surface 332, and a rounded shape. It consists of two pitches 333.

As described above, by forming the second pitch 333 of the reflecting plate 300 in a round shape, impact from the outside applied to the reflecting plate 300 is compared with when the second pitch 333 is sharply formed. Can be mitigated.

7 is a cross-sectional view showing in detail a reflecting plate according to another embodiment of the present invention.

Referring to FIG. 7, the reflector plate 300 is formed on the support layer 310, the support layer, a light collecting layer 320 having a plurality of protrusions 325, and a reflective layer 330 stacked on the support layer 310 in a uniform thickness. And a protective layer 350 having a flat surface structure and stacked on the reflective layer 330 to protect the reflective layer 330.

In this case, since the protective layer 350 has a flat surface structure regardless of the structure of the reflective layer 330, the protective layer 350 can more reliably protect the reflective layer 330 by mitigating an impact from the outside.

Hereinafter, the reason for setting the first and second angles A1 and A2 of the reflective plate 300 to 30 ° to 45 ° will be described in detail.

8A to 8C are diagrams for describing the shape of the reflecting plate. 8A to 8C, the incident angle is an angle formed by the incident light and the plane normal, the exit angle is an angle formed by the exit light and the plane, and the reflection angle is defined as an angle formed by the reflected light and the plane normal. The angle of refraction is defined as the angle formed by the light emitted from the refraction and the normal of the plane. In addition, '-' is defined as the side where the support layer 310 is located based on the normal of the third reflective surface 341, and '+' is defined as the liquid crystal display based on the normal of the third reflective surface 341. It is defined as the side where the panel 500 is located.

However, it will be described on the premise that the third light emitted from the light guide plate is emitted with an exit angle of 60 °. That is, since the light guide plate 200 is made of PMMA material, the light guide plate 200 has a refractive index of 1.49, and the critical angle is approximately 42.156 °. Therefore, referring to FIG. 8A, the emission angle of the third light is the reflective layer 330. The first reflective surface 331 and the support layer 310 are inclined at the support layer 310 and the first angle A1. And the second reflection surface 332 inclined at a second angle A2. Here, the first angle A1 is 30 °, and the second light L2 emitted from the light guide plate 200 is emitted at an exit angle θ, that is, at an angle of 60 ° to the first reflection surface. It is incident on 331. In this case, the first incident angle α1 of the second light L2 has an angle of −30 ° by the first angle A1 and the exit angle θ. Thereafter, the third light L3 passes from the first reflecting surface 331 to the third light L3 having an angle of + 30 °, that is, a first reflecting angle β1 equal to the first incident angle α1. Reflected. Here, the third light L3 has an angle of 90 ° with respect to the support layer 310 and proceeds toward the liquid crystal display panel.

Referring to FIG. 8B, the first angle A1 formed by the support layer 310 and the first reflective surface 331 is 45 ° and the second light L2 emitted from the light guide plate 200 is emitted. That is, it is emitted with an angle of 60 ° and is incident on the first reflective surface 331. In this case, the second incident angle α2 of the second light L2 has an angle of −15 ° by the first angle A1 and the exit angle θ. Thereafter, the second light L2 passes from the first reflecting surface 331 to the third light L3 having a second reflecting angle β2 equal to the second incident angle α2, that is, an angle of + 10 °. Reflected. Here, the third light L3 has an angle of 60 ° with respect to the support layer 310 and proceeds toward the liquid crystal display panel.

Referring to FIG. 8C, the first angle A1 formed by the support layer 310 and the first reflective surface 331 is 60 °, and the second light L2 emitted from the light guide plate 200 is emitted. It is emitted with an angle θ, that is, an angle of 60 °, and is incident on the first reflective surface 331. In this case, the second light L2 is incident in parallel with the normal line of the first reflective surface 331. Thereafter, the second light L2 is reflected by the first reflection surface 331 and is emitted as the third light L3 parallel to the normal line. The third light L3 is inclined at an angle of 30 degrees with respect to the support layer 310 and provided to the liquid crystal display panel.

As described above, when the first angle A1 of the first reflective surface 331 and the support layer 310 is 30 °, the third light L3 is directed toward the liquid crystal display panel. Proceed. Therefore, it is most preferable to set the said 1st angle A1 to 30 degrees. However, even when the first angle A1 is 45 °, since the third light L3 proceeds almost straight to the liquid crystal display panel, the first angle A1 is an angle within a range of 30 to 45 °. Has

9 is a cross-sectional view showing in detail the structure of the light guide plate shown in FIG. 2, and FIG. 10 is a perspective view showing part A of FIG. 9 in detail.

Referring to FIG. 9, the light guide plate 200 is provided at the side where the lamp unit 100 is disposed, the incident surface 210 to which the first light L1 is incident, and the reflective layer of the reflective plate 300. 330 is opposite to the first emission surface 220 and the first emission surface 220 for emitting the second light L2 by guiding the first light L1 toward the reflecting plate 300. And a second emission surface 230 for passing through the third light L3 reflected by the reflection plate 300.

The first emission surface 220 protrudes toward the reflective plate 300 and includes a light guide pattern 221 for guiding the first light L1 toward the reflective plate 300. The light guide pattern 221 is formed in a dot shape on the first emission surface 220 and is integrally formed with the light guide plate 200.

9 and 10, the light guide pattern 221 has a hexahedral shape, and the first surface 221a and the first surface 221a of the first exit surface 220 are in contact with each other. The second surface 221b, the first surface 221a and the second surface 221b adjacent to the second surface, that is, the first to fourth sides 221c, 221d, 221e, and 221f.

The light guide pattern 221 has a distance d1 from the first surface 221a to the second surface 221b between the four sides 221c, 221d, 221e, and 221f facing each other. It is formed into a cuboid shape longer than the distance d2. In this case, the light guide pattern may be formed in a cube shape. Here, the distance d2 between the four side surfaces 221c, 221d, 221e, and 221f is kept constant from the first surface 221a to the second surface 221b.

As described above, by forming the light guide pattern 221, the front luminance is improved by the reflecting plate 300, and the light of the second light L2 incident through the first emission surface 220 is again provided. Prevents the property from changing.

Here, the optical characteristics of the light guide plate 200 will be described in order to help understanding of the present invention.

As shown in FIG. 9, since the light guide plate 200 is formed of a PMMA-based material, the light guide plate 200 has a refractive index of 1.49 and a critical angle is approximately 42.156 °. The first light L1 incident through the incident surface 210 of the light guide plate 200 proceeds to the exit surface 230 side of the light guide plate 200 and is in contact with the exit surface 230. In this case, when the third incidence angle α3 of the first light L1 is smaller than the threshold angle, the light is emitted with a first refractive angle γ1 that is greater than the third incidence angle α3. On the other hand, when the third angle of incidence α3 is smaller than the critical angle, the third incident angle α3 is reflected by the emission surface 230 and proceeds toward the first emission surface 220. Here, the first light L1 is reflected at a third reflection angle β3 which is the same as the third incident angle α3.

Thereafter, the first light L1 travels toward the first emission surface 220 and contacts the second side surface 221d of the light guide pattern 221. In this case, since the angle formed by the normal between the first light L1 and the second side surface 221d (hereinafter, the fourth incidence angle α4) is smaller than the critical angle of the light guide plate 200, the first light L1 is It exits through the 2nd side surface 221d. Since the first light L1 is smaller than the critical angle, the first light L1 is emitted toward the reflecting plate 330 with a second refractive angle γ2 greater than the fourth incident angle α4.

Here, the second refraction angle γ 2 is defined by the following equation (1).

N * SIN α4 = SIN γ2

Here, 'N' is a refractive index of the light guide plate 200.

As described above, the fourth light L3 emitted from the light guide plate 200 toward the reflecting plate 300 may require the fourth incidence angle α4 to be smaller than a critical angle of the light guide plate 200. Incident angle (alpha) 4 exists between 0 degrees and 42.156 degrees. On the other hand, the second angle of refraction γ2 has an angle between approximately 0 ° and 47.844 ° according to Equation (1), and the emission angle θ of the third light L3 is between 42.156 ° and 90 °. Has an angle.

FIG. 11 is a plan view specifically illustrating a first exit surface of the light guide plate illustrated in FIG. 9.

Referring to FIG. 11, a plurality of light guide patterns 221 are formed on the first emission surface 220 of the light guide plate 200. The distance between the light guide patterns 221 is narrower as the distance from the lamp unit 100. Here, the area B of the first emission surface 220 is an area adjacent to the lamp unit 100, and the area C is located opposite to the area B and has an area equal to that of the area B.

Comparing the two regions, six light guide patterns 221 are formed in the B region, and four light guide patterns 221 are formed in the C region. That is, as the distance from the lamp unit 100 increases, the number of the light guide patterns 221 per unit area increases, so that the density of the light guide patterns 221 increases.

The reason for forming the light guide pattern 221 as described above is as follows. In general, since the lamp unit 100 is provided at one side of the light guide plate 200, the brightness of the lamp unit 100 is high at one side where the lamp unit 100 is provided, while the other side of the lamp unit 100 is opposite to the one side of the light guide plate 200. low. In order to compensate for the luminance difference, the light guide pattern 221 is formed more densely away from the lamp unit 100.

Therefore, the amount of light traveling to the reflector 300 in the region B and the amount of light traveling to the reflector 300 in the region C are substantially the same.

12 is a view specifically showing a light path in the backlight assembly according to the present invention. However, when the first light L1 from the lamp unit 100 is incident on the second emission surface 230 of the light guide plate 200 with the third incident angle α3, the third incident angle α3 is The case of 70 degrees is demonstrated as an example.

Referring to FIG. 12, the first light L1 from the lamp unit 100 travels toward the second emission surface 230 of the light guide plate 200 and contacts the second emission surface 230. The first light L1 is incident on the second emission surface 230 at a third incident angle α3, that is, at an angle of 70 °. In this case, since the third incident angle α3 is greater than the critical angle of the light guide plate 200, that is, 42.156 °, the first light L1 has the same third reflection angle β3 as the third incident angle α3. It is reflected toward the first exit surface 220.

The first light L1 reflected by the second exit surface 230 travels toward the first exit surface 220, and then receives a fourth incident angle (4d) from the second side surface 221d of the light guide pattern 221. incident with α4). In this case, since the fourth incident angle α4 is 20 ° and smaller than the critical angle of the light guide plate 200, the second light L2 has a fourth incident angle α4 based on the normal of the second side surface 221d. The second refracting angle γ2 is emitted toward the reflecting plate 300 side. At this time, the second refraction angle γ2 is approximately 30 ° by the above expression (1).

Therefore, the second light L2 is emitted from the second side surface 221d at an exit angle θ, that is, an angle of approximately 60 °. Thereafter, the second light L2 travels toward the reflective plate 300 and contacts the reflective surface 331 of the reflective plate 300. In this case, since the reflective surface 331 is inclined at the support layer 310 and the first angle A1, that is, at an angle of 30 °, the reflective surface 341 is an extension line of the second side surface 221d. 221g) and make an angle of 60 °. Accordingly, the first incident angle α1 at which the second light L2 is incident on the reflective surface 331 is 30 °. That is, the second light L2 forms an angle of -30 ° with the normal of the reflective surface 331.

In this case, the second light L2 is reflected from the reflective surface 331 at an angle equal to the first incident angle α1, that is, + 30 °. Accordingly, the third light L3 is emitted at an angle of 90 ° with respect to the support layer 310, and is incident to the front of the liquid crystal display panel 500. As a result, the front luminance of the liquid crystal display panel 500 is improved.

According to the present invention, after the first light generated from the light source is incident on the light guide plate side, the path is changed by the light guide plate and emitted as the second light directed toward the reflector plate side. Thereafter, the second light is collected by the reflector having a triangular prism-shaped surface structure and reflected as third light having improved front luminance. The third light is provided to the liquid crystal display panel and displayed as an image.

Therefore, since the reflecting plate receives the third light traveling to the front of the liquid crystal display panel, the reflecting plate serves as a conventional prism sheet, thereby reducing the number of sheets required for the liquid crystal display device. The overall size and weight of the liquid crystal display device can be minimized.

Although described with reference to the examples, those skilled in the art can understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention described in the claims below. There will be.

Claims (9)

A light source for generating first light; An incident surface on which the first light is incident, a first emission surface for guiding the first light to emit a second light, and a third light incident through the first emission surface, facing the first emission surface; A light guide plate made of a second emission surface for emitting light; A lower side of the first exit surface of the light guide plate, a) a support layer, b) protruding from the surface of the support layer, and extending from a first end of the support layer to a second end opposite to the first end; A light collecting layer having a plurality of protrusions formed, c) a reflective layer covering the entire surface of the light collecting layer and provided with a uniform thickness on the light collecting layer, and d) a protective layer laminated on the reflective layer to protect the reflective layer. A reflection plate for reflecting the second light to provide the third light having improved front brightness to the light guide plate; And And a liquid crystal display panel for receiving the third light from the light guide plate to display an image. The first inclined surface of claim 1, wherein each of the plurality of protrusions comprises a first inclined surface inclined at a first angle with a surface of the support layer, and a second inclined surface inclined at a second angle with a surface of the support. And one pitch formed by the second inclined surface. 3. The liquid crystal display device according to claim 2, wherein the first and second angles are each 30 deg. To 45 deg. 4. The liquid crystal display device according to claim 3, wherein the first and second angles are the same. 3. The liquid crystal display device according to claim 2, wherein the pitch is formed in a round shape. The liquid crystal display of claim 1, wherein the protective layer is laminated on the reflective layer with a uniform thickness. The liquid crystal display device according to claim 1, wherein the protective layer has a flat surface structure. The liquid crystal display of claim 1, wherein the protective layer is made of a transparent material. The light emitting device of claim 1, wherein the first emission surface protrudes toward the reflecting plate at a predetermined height, is formed in a dot shape, and has a plurality of light guide patterns for guiding the first light toward the reflecting plate. A liquid crystal display device.