KR101632674B1 - Reflector and liquid crystal display device module including the same - Google Patents

Abstract

The present invention relates to a reflector for a liquid crystal display and a liquid crystal display using the same.

A feature of the present invention is to form a pattern of a specific shape for allowing light incident into the light guide plate to enter the reflective plate in the direction of the liquid crystal panel.

Accordingly, the reflection plate reflects the light passing through the lower surface of the light guide plate toward the liquid crystal panel, thereby improving the luminance of the light, and at the same time, the light incident into the light guide plate is totally reflected inside the light guide plate, thereby providing a uniform surface light source to the liquid crystal panel .

It is possible to prevent the problem that the high cost is consumed to form the pattern on the lower surface of the light guide plate, and the backlight unit has the effect of reducing manufacturing cost compared with the conventional one.

Light guide plate, pattern, reflector, liquid crystal display

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a reflector and a liquid crystal display device including the reflector,

The present invention relates to a reflector for a liquid crystal display and a liquid crystal display using the same.

2. Description of the Related Art In recent years, the display field has rapidly developed in line with the information age. In response to this trend, a flat panel display device (FPD) having a thinness, light weight, A plasma display panel (PDP), an electroluminescence display device (ELD), and a field emission display device (FED) : CRT).

Among these, the liquid crystal display device is excellent in moving picture display and is most actively used in the fields of notebook computers, monitors, TVs and the like due to its high contrast ratio. The liquid crystal display device does not have a self- And a light source is required.

Accordingly, a backlight unit having a light source is provided on the back surface, and light is emitted toward the front of the liquid crystal panel, thereby realizing an image of brightness that can be recognized only through the backlight unit.

In general, an ordinary backlight unit is divided into an edge type and a direct type depending on the arrangement of light sources. In the edge type, one or a pair of light sources may be disposed on one side of the light guide plate, Two or two pairs of light sources are disposed on both side portions of the light guide plate, and the direct type has a structure in which several light sources are disposed under the optical sheet.

Here, the edge type is easier to manufacture than the direct type, and is advantageous in that it is thin, light in weight, and low in power consumption as compared with the direct type.

1 is an exploded perspective view of an edge type backlight unit.

The general backlight unit 20 includes a lamp 29a as a light source and a light guide plate 23 and a light guide plate 23 which are positioned on the same plane as the lamp 29a and at least one side faces the lamp 29a, And a plurality of optical sheets 21 that are seated on the top.

A reflection plate 25 for reflecting the light exiting toward the lower surface of the light guide plate 23 is further formed under the light guide plate 23 and a lamp guide 29b for guiding the lamp 29a is further provided.

Here, the optical sheet 21 on the light guide plate 23 includes a diffusion sheet and at least one light-condensing sheet or the like to diffuse or condense light that has passed through the light guide plate 23.

The light guide plate 23 is formed of a plastic material such as polymethylmethacrylate (PMMA) or polycarbonate (PC), which is an acrylic transparent resin, which is one of the transparent materials capable of transmitting light. It is made in flat type.

At this time, a pattern 23a having a specific shape is formed on the lower surface of the light guide plate 23, that is, on one side of the light guide plate 23 facing the reflection plate 25, Molding method.

The light guide plate 23 has a high raw material value, and the process of forming the pattern 23a having a specific shape on the lower surface due to such a high cost is also disadvantageous in that it is expensive.

For example, it means that a defect occurs in the process of forming the pattern 23a having a specific shape on the lower surface of the light guide plate 23. [

Particularly, recently, a large-area screen liquid crystal display device is required, so that the light guide plate 23 of the edge-type backlight unit 20 used in such a large-screen liquid crystal display device also has a size The above disadvantages are becoming more and more evident.

Such a high-cost light guide plate 23 increases the production cost of the entire backlight unit 20, which results in a problem of increasing the overall manufacturing cost of the liquid crystal display device.

SUMMARY OF THE INVENTION It is a first object of the present invention to reduce the manufacturing cost of a backlight unit.

A second object of the present invention is to reduce the manufacturing cost of the LCD.

According to an aspect of the present invention, there is provided a liquid crystal display comprising: a liquid crystal panel; A backlight unit disposed below the liquid crystal panel, the backlight unit comprising: a light source; A light guide plate on which the light source is arranged along one side surface, a plurality of optical sheets seated on the light guide plate; And a reflective film disposed under the light guide plate and having a pattern formed thereon, wherein the reflective plate includes a support film disposed under the light guide plate and a reflection film disposed under the support film, A liquid crystal display device is provided.

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The reflective film may be formed of at least one selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate, polymethly methacrylate (PMMA), polycarbonate, polystyrene, polyolefin, Wherein the reflective film comprises at least one of cellulose acetate and polyvinyl chloride and the reflective film comprises at least one of titanium oxide (TiO ₂ ), silicon oxide (SiO ₂ ), zinc oxide (ZnO), lead carbonate (PbCO ₃ ), and further comprising a barium sulfate (BaSO _4), calcium carbonate (CaCO ₃₎ and at least one of aluminum oxide (Al ₂ O _3).

The support film may be formed of at least one selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate, polymethly methacrylate (PMMA), polycarbonate, polystyrene, polyolefin, Wherein the supporting film comprises at least one of cellulose acetate and polyvinyl chloride and the supporting film is made of aluminum (Al), copper (Cu), nickel (Ni), silver (Ag) .

Here, the pattern may be an elliptical pattern, a polygon pattern, a prism pattern, or a lenticular pattern. The light source may be a cold cathode fluorescent lamp (CCFL) An external electrode fluorescent lamp, or a light emitting diode (LED).

As described above, according to the present invention, by forming a specific pattern for directing the light incident into the light guide plate toward the liquid crystal panel to the reflection plate, the reflection plate reflects light passing through the lower surface of the light guide plate toward the liquid crystal panel The brightness of light is improved and the light incident into the light guide plate is totally reflected within the light guide plate, thereby providing a uniform planar light source to the liquid crystal panel.

Particularly, it is possible to prevent a problem that a high cost is consumed to form a pattern on the lower surface of the light guide plate, and the backlight unit has an effect of reducing the manufacturing cost compared with the conventional case.

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

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

As shown in the figure, the liquid crystal display device includes a liquid crystal panel 110, a backlight unit 120, a support main body 130 for modularizing the liquid crystal panel and the backlight unit, a cover bottom 150, and a top cover 140 do.

First of all, the liquid crystal panel 110 plays a key role in image display, and includes first and second substrates 112 and 114 which are bonded to each other with a liquid crystal layer interposed therebetween .

At this time, a plurality of gate lines and data lines intersect on the inner surface of the first substrate 112, which is usually called a lower substrate or an array substrate, although a pixel is not clearly shown in the figure, And a thin film transistor (TFT) is provided at each intersection point, and is connected to the transparent pixel electrode formed in each pixel in a one-to-one correspondence manner.

On the inner surface of the second substrate 114, which is called an upper substrate or a color filter substrate, color filters of R, G, and B colors corresponding to the respective pixels, a gate line and a data line, And a black matrix covering a non-display element such as a thin film transistor is provided. In addition, a transparent common electrode covering these elements is provided.

The printed circuit board 117 is connected to at least one edge of the liquid crystal panel 110 via a connection member 116 such as a flexible circuit board so that the side surface or the cover bottom 150).

In the liquid crystal panel 110 having the above-described structure, when a thin film transistor selected for each gate line is turned on by a scan on / off signal, a signal voltage is transmitted to the corresponding pixel electrode through the data line, The alignment direction of the liquid crystal molecules is changed by the electric field between the electrodes and the common electrode, and the difference in transmittance is shown.

At this time, a polarizing plate (not shown) for selectively transmitting only specific polarized light is attached to the outer surfaces of the first and second substrates 112 and 114.

Although not clearly shown in the drawing, the upper and lower alignment films for determining the initial alignment direction of the liquid crystal are interposed at the boundary between the two substrates 112 and 114 of the liquid crystal panel 110 and the liquid crystal layer, A seal pattern is formed along the edges of both substrates 112 and 114 to prevent leakage of the liquid crystal layer.

In addition, the liquid crystal display device according to the present invention is provided with a backlight unit 120 for supplying backlight of the liquid crystal panel 110 so that a difference in transmittance represented by the liquid crystal panel 110 is externally expressed.

The backlight unit 120 includes a lamp 129a, a white or silver reflective plate 200, a light guide plate 123 mounted on the reflective plate 200, and a plurality of optical sheets 121 interposed therebetween do.

The lamp 129a is positioned at one side of the light guide plate 123 so as to face the light incident portion of the light guide plate 123. The lamp 129a is guided outward by the lamp guide 129b.

The plurality of optical sheets 121 on the light guide plate 123 may include a diffusion sheet and at least one light collecting sheet and may diffuse or condense the light passing through the light guide plate 123, So that a uniform planar light source is incident.

The reflection plate 200 is positioned below the light guide plate 123 and reflects light passing through the lower surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the brightness of light.

Particularly, in the reflection plate 200 of the present invention, light incident to the inside of the light guide plate 123 is totally reflected within the light guide plate 123, thereby forming a specific pattern for supplying a uniform surface light source to the liquid crystal panel 110 .

The light emitted from the lamp 129a is incident on the light guide plate 123 through the light incident portion of the light guide plate 123. The incident light travels through the light guide plate 123 by total reflection several times by the reflection plate 200 And spreads evenly over a wide area of the light guide plate 123 to provide a surface light source to the liquid crystal panel 110. [

That is, the light emitted from the lamp 129a of the present invention is totally reflected in the light guide plate 123 by a pattern of a specific pattern formed on the reflection plate 200 and spreads evenly over a wide area of the light guide plate 123, Thereby providing a planar light source to the liquid crystal panel 110.

Let me take a closer look at this later.

The liquid crystal panel 110 and the backlight unit 120 are modularized through a top cover 140, a support main 130 and a cover bottom 150. The top cover 140 is disposed on the upper surface and the side surface of the liquid crystal panel 110, The top cover 140 is opened so that an image formed on the liquid crystal panel 110 is displayed.

The cover bottom 150, on which the liquid crystal panel 110 and the backlight unit 120 are mounted and is a basis for assembling the entire structure of the liquid crystal display device, is formed into a rectangular plate shape, do.

The support main body 130 which is mounted on the cover bottom 150 and has a rectangular frame shape covering the edges of the liquid crystal panel 110 and the backlight unit 120 is combined with the top cover 140 and the cover bottom 150.

The cover main body 130 may be referred to as a guide panel or a main support or a mold frame. The cover main body 130 may be referred to as a bottom cover or a bottom cover, I will.

At this time, the backlight unit 120 having the above-described structure is generally called a side light type, and a plurality of lamps 129a can be arranged in a plurality of layers according to the purpose. Furthermore, it is also possible to interpose the lamps 129a correspondingly along both edges of the light guide plate 123 facing each other.

Meanwhile, the backlight unit 120 of the liquid crystal display of the present invention has an effect of reducing the manufacturing cost compared with the conventional one, which can omit the step of forming the pattern on the lower surface of the high-cost light guide plate 123 It is because.

That is, since the backlight unit 120 of the liquid crystal display of the present invention does not have a specific pattern on the lower surface of the light guide plate 123, it is possible to reduce the manufacturing cost of the light guide plate 123, Panel 110 as shown in FIG.

This can be achieved by forming a pattern of a specific shape on the reflector 200 located under the light guide plate 123. Hereinafter, a more detailed description will be given with reference to FIG.

3 is an exploded perspective view of the backlight unit of Fig.

2, the backlight unit 120 includes a reflector 200 of white or silver color resting on a cover bottom (150 in FIG. 2), a lamp 129a as a light source arranged along one longitudinal edge of the reflector 200, A light guide plate 123 which is located on the same plane as the lamp 129a and is placed on the reflection plate 200 and has at least one side thereof facing the lamp 129a and a plurality of optical sheets 121 ).

The lamp guide 129b guiding the lamp 129a is further provided so as to surround the upper and lower sides and the outside of the lamp 129a with the inner side facing the light guide plate 123 being open, 129a in the direction of the light guide plate 123.

The lamp 129a may be a fluorescent lamp such as a cold cathode fluorescent lamp or an external electrode fluorescent lamp as a light source. Alternatively, in addition to such a fluorescent lamp, a light-emitting diode lamp may be used as the lamp 129a, and when the light-emitting diode lamp is used, the lamp guide 129b may be eliminated.

The light guide plate 123 is made of a plastic material such as polymethylmethacrylate (PMMA) which is an acrylic transparent resin which is one of transparent materials capable of transmitting light, or a polycarbonate (PC) (Flat type). Here, PMMA is an acrylic resin, which is excellent in transparency, weatherability, and colorability, and induces light diffusion when light is transmitted.

In particular, the reflector 200 of the present invention is positioned at a lower portion of the light guide plate 123 and reflects light passing through the lower surface of the light guide plate 123 toward the liquid crystal panel 110 And the light incident into the light guide plate 123 is totally reflected within the light guide plate 123, thereby providing a uniform surface light source to the liquid crystal panel 110 (FIG. 2).

This is because a pattern 210 of a specific shape for allowing light incident into the light guide plate 123 to enter the liquid crystal panel 110 in FIG. 2 is formed on the reflection plate 200.

The light emitted from the lamp 129a is incident on the light guide plate 123 through the light incident portion of the light guide plate 123. The incident light travels through the light guide plate 123 by total reflection several times by the reflection plate 200 And spreads evenly over a wide area of the light guide plate 123 to provide a surface light source to the liquid crystal panel 110 (FIG. 2).

That is, the light emitted from the lamp 129a of the present invention is totally reflected in the light guide plate 123 by the pattern 210 of the specific shape formed on the reflection plate 200 and spreads evenly over a wide area of the light guide plate 123, Thereby providing a uniform surface light source to the liquid crystal panel (110 of FIG. 2).

Accordingly, the backlight unit 120 of the present invention has the effect of reducing the manufacturing cost compared with the conventional one.

In more detail, the light guide plate 123 is formed of a high-cost raw material such as a transparent material capable of transmitting light. When the cost of the raw material is high, the process for processing the light guide 123 also requires a high cost.

That is, forming a pattern for causing light incident into the light guide plate 123 to enter the lower surface of the light guide plate 123 in the direction of the liquid crystal panel 110 (FIG. 2) is accompanied by a high cost of manufacturing the light guide plate 123 it means.

2, a pattern 210 of a specific shape for entering the light incident into the light guide plate 123 in the direction of the liquid crystal panel 110 (see FIG. 2) is disposed at a lower portion of the light guide plate 123 It is possible to omit the step of forming a pattern on the lower surface of the light guide plate 123, thereby reducing the manufacturing cost of the light guide plate 123. [

The plurality of optical sheets 121 on the light guide plate 123 diffuse or condense the light that has passed through the light guide plate 123 so that a more uniform surface light source is incident on the liquid crystal panel 110 And at least one light condensing sheet.

Here, the diffusion sheet is positioned directly above the light guide plate 123, and serves to adjust the direction of the light so that the light advances toward the light condensing sheet while dispersing the light incident through the light guide plate 123.

The light diffused through the diffusion sheet by the light condensing sheet is condensed in the direction of the liquid crystal panel (110 in Fig. 2). Accordingly, the light passing through the light condensing sheet proceeds almost perpendicularly to the liquid crystal panel (110 in FIG. 2) to provide a uniform luminance distribution.

Therefore, the light emitted from the lamp 129a is uniformly and high-quality processed while passing through the reflection plate 200, the light guide plate 123, and the plurality of optical sheets 121, and is incident on the liquid crystal panel (110 of FIG. 2) , And the liquid crystal panel (110 in Fig. 2) can display an image with high brightness only by using it.

At this time, in order to improve the brightness by improving the light condensing ability, it is also possible to use two or more light condensing sheets to be used in a superposed manner.

4 is a perspective view schematically showing the structure of a reflection plate according to an embodiment of the present invention.

3, the reflection plate 200 according to the embodiment of the present invention is disposed at a lower portion of the light guide plate 123 (see FIG. 3), and transmits light passing through the lower surface of the light guide plate 123 And a support film 203 for minimizing the external deformation of the reflection plate 200. The reflection film 201 is formed of a reflective film 201,

The reflection film 201 may be a white opaque synthetic resin such as polyethylene terephthalate (PET), polyethylene naphthalate, polymethly methacrylate (PMMA), polycarbonate, polystyrene (TiO ₂ ), silicon oxide (SiO ₂ ), zinc oxide (ZrO ₂ ), or the like as a white pigment, at least one of polyvinyl chloride, polystyrene, polyolefine, cellulose acetate and polyvinyl chloride ZnO), further comprises a lead carbonate (PbCO _3), barium sulfate (BaSO _4), calcium carbonate (CaCO ₃₎ and at least one of aluminum oxide (Al ₂ O _3).

Since the reflective film 201 has light reflectivity, light that has passed through the lower surface of the light guide plate 123 (FIG. 3) is reflected toward the liquid crystal panel (110 of FIG. 2) by the reflective film 201.

A support film 203 is further provided on the reflective film 201 to fix the shape of the reflective film 201. The support film 203 may be made of a polymer material and has excellent light reflection efficiency And may be made of a metal material such as an aluminum (Al) material having a high thermal conductivity.

Herein, the polymer material is a polymeric material such as polyethylene terephthalate (PET), polyethylene naphthalate, polymethly methacrylate (PMMA), polycarbonate, polystyrene, polyolefin, cellulose acetate cellulose acetate and polyvinyl chloride.

When the support film 203 is made of a metal material, the reflection plate 200 prevents deterioration due to heat generated when the backlight unit 120 (FIG. 3) is driven.

At this time, in addition to aluminum (Al), it may be formed of a metal such as copper (Cu), nickel (Ni), silver (Ag) or graphite excellent in thermal conductivity.

Since the shape of the reflective film 201 can be fixed through the support film 203, the optical characteristics of the reflective film 201 can be maintained.

Particularly, on one side of the support film 203, that is, on one side of the light guide plate 123 (see FIG. 3), light incident into the light guide plate 123 (see FIG. 3) is totally reflected within the light guide plate 123 (110 in FIG. 2) is formed with a pattern 210 of a specific shape for providing a uniform surface light source.

The pattern 210 formed on the support film 203 can be formed in various shapes such as an elliptical pattern, a polygon pattern, a prism pattern, and a lenticular pattern. , And the support film (203) is formed on one side by a printing method or a laser forming method.

The pattern 210 can make more light toward the liquid crystal panel (110 in FIG. 2) as the size of the pattern is small or dense.

The pattern 210 formed on the support film 203 controls the reflection path of the light incident into the light guide plate 123 (FIG. 3) so as to improve the luminance uniformity, It is preferable to form it at a low density per unit area and to form it at a high density as it contacts the center.

Therefore, the reflection plate 200 of the present invention reflects the light passing through the lower surface of the light guide plate 123 (FIG. 3) toward the liquid crystal panel (110 of FIG. 2) (See FIG. 3), thereby providing a uniform surface light source to the liquid crystal panel 110 (FIG. 2).

Although not shown, the reflector 200 according to the present invention may further include an anchor coat layer between the reflection film 201 and the support film 203. The anchor coat layer may be formed of a reflective film 201, A plasma treatment, a glow discharge treatment, a reverse sputter treatment, a roughening (roughness) treatment as a means for obtaining excellent adhesion strength of the support film 203 and the support film 203, Surface treatment) may be performed.

The anchor coat layer may be formed from a reactive polyester resin, an alkyd resin, a urethane-modified alkyd resin, a melamine-modified alkyd resin, an epoxy resin, ) Acrylic resin, an epoxy resin, a mixture thereof, or an inorganic coating agent such as a silane coupling agent may be used.

A top coat layer may be further formed on the top surface of the reflective film 201 for the purpose of maintaining the reflectance while preventing the reflection film 201 from being oxidized. And an acrylic resin containing a functional additive such as an antioxidant or an ultraviolet shielding agent for preventing contamination of the reflection film 201 due to oxidation and contact of foreign matter.

In addition to the topcoat layer, a moire preventing layer can be further constructed. The anti-moir 辿 layer has a light diffusing property to prevent a moiré phenomenon in which stripes appear on a screen on which an image is displayed.

Also, a moisture-proof coating layer for moisture-proofing may be further formed on the lower layer of the reflective film 201 which is the bottom surface of the reflection plate 200.

The reflection plate 200 is manufactured by pressing using a roll in a heat fusion manner.

5 is a cross-sectional view schematically illustrating the path of light emitted from a lamp according to an embodiment of the present invention.

In the drawings, only the characteristic features of the present invention are highlighted, and only a lamp, which is a light source, a light guide plate, and a reflector formed with a pattern according to an embodiment of the present invention are illustrated.

The light emitted from the lamp 129a is incident into the light guide plate 123 through the light incident portion of the light guide plate 123, as shown in the figure.

At this time, the lamp 129a is guided by the lamp guide 129b, and the light emitted from the lamp 129a is concentrated in the direction of the light guide plate 123.

 The light incident into the light guide plate 123 is totally reflected several times in the light guide plate 123 by the pattern 210 formed on the reflection plate 200 and travels through the light guide plate 123 to spread evenly over a wide area of the light guide plate 123 This light is reflected by the pattern 210 formed on the reflection plate 200 and emitted in the direction of the liquid crystal panel (110 in FIG. 2).

The light emitted in the direction of the liquid crystal panel (110 in FIG. 2) is processed into uniform high quality while passing through a plurality of optical sheets (121 in FIG. 3), and is then uniformly irradiated onto the liquid crystal panel And the liquid crystal panel (110 of FIG. 2) can display an image of high brightness only by using the incident light.

6A, the pattern 210 may be formed on the other surface of the support film 203 of the reflection plate 200, that is, on one side of the reflection film 201 facing the reflection film 201. As shown in FIG. 6B, The film may be removed and a pattern 210 may be formed on one side of the reflective film 201. [

FIGS. 7A and 7B are photographs for comparing images of a liquid crystal display device including a backlight unit in which a conventional pattern is formed on a light guide plate and a liquid crystal display device including a backlight unit in which a pattern is formed on a reflection plate, according to an embodiment of the present invention.

FIG. 7A is a liquid crystal display device including a backlight unit in which a pattern is formed on a lower surface of a light guide plate, and FIG. 7B is a simulation result of an image of a liquid crystal display device including a backlight unit in which a pattern is formed on a reflection plate.

Referring to FIGS. 7A and 7B, it can be seen that FIGS. 7A and 7B both implement similar images.

As a result, it can be seen that there is no problem in implementing an image even if a pattern for providing a uniform planar light source to the liquid crystal panel is formed on the light guide plate or formed on the reflection plate by allowing light incident into the light guide plate to be totally reflected within the light guide plate .

Therefore, by forming the pattern on the reflector, the light passing through the lower surface of the light guide plate is reflected toward the liquid crystal panel, thereby improving the brightness of the light and allowing the light incident into the light guide plate to be totally reflected inside the light guide plate, Thereby providing a light source.

Particularly, it is possible to prevent a problem that a high cost is consumed to form a pattern on the lower surface of the light guide plate, and the backlight unit has an effect of reducing the manufacturing cost compared with the conventional case.

As described above, in particular, the reflection plate of the present invention is positioned at the lower portion of the light guide plate and reflects the light passing through the lower surface of the light guide plate toward the liquid crystal panel, thereby improving the brightness of light. Thereby providing a uniform surface light source to the liquid crystal panel.

This is because a specific pattern is formed on the reflection plate to make the light incident into the light guide plate enter the liquid crystal panel.

The light emitted from the lamp is incident into the light guide plate through the light incident portion of the light guide plate. The incident light travels through the light guide plate by total reflection several times by the reflection plate, spreads evenly over a wide area of the light guide plate, .

That is, the light emitted from the lamp of the present invention is totally reflected in the light guide plate by a specific pattern formed on the reflection plate, and is evenly spread to the wide area of the light guide plate, thereby providing a uniform surface light source to the liquid crystal panel.

Accordingly, it is possible to omit the process of forming a pattern on the lower surface of the light guide plate, thereby reducing the manufacturing cost of the light guide plate. Thus, the backlight unit of the present invention has the effect of reducing the manufacturing cost .

The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

1 is an exploded perspective view of an edge type backlight unit.

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

3 is an exploded perspective view of the backlight unit of Fig.

4 is a perspective view schematically showing the structure of a reflection plate according to an embodiment of the present invention.

5 is a cross-sectional view schematically illustrating the path of light emitted from a lamp according to an embodiment of the present invention;

 6A to 6B are sectional views schematically showing various configurations of a reflection plate according to an embodiment of the present invention.

7A to 7B are photographs for comparing images of a liquid crystal display including a backlight unit in which a conventional pattern is formed on a light guide plate and a liquid crystal display including a backlight unit having a pattern formed on a reflector according to an embodiment of the present invention.

Claims (10)

A liquid crystal panel; A backlight unit disposed below the liquid crystal panel, the backlight unit comprising: a light source; A light guide plate having the light source arranged along one side thereof; A plurality of optical sheets seated on the light guide plate; A reflective plate disposed under the light guide plate and having a pattern formed thereon, Wherein the reflection plate includes a support film disposed on the lower side of the light guide plate and having a flat upper surface facing the light guide plate, a reflective film disposed on the lower side of the support film and having a flat upper surface facing the support film and a lower surface opposite to the upper surface, Is provided on a lower surface of the support film opposite to the upper surface facing the reflective film, An anchor coat layer may be provided between the reflective film and the support film or a top coat layer or anti-Moire layer may be provided on the reflective film, or a moisture-proof coating layer may be provided on a lower layer of the reflective film . delete delete The method according to claim 1, The reflective film may be formed of a material selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate, polymethly methacrylate (PMMA), polycarbonate, polystyrene, polyolefine, cellulose acetate cellulose acetate, and polyvinyl chloride. 5. The method of claim 4, The reflective film of titanium (TiO _2), silicon oxide (SiO _2), zinc oxide (ZnO), lead carbonate (PbCO _3), barium sulfate (BaSO _4), calcium carbonate (CaCO ₃₎ and aluminum oxide (Al ₂ O ₃ ). ≪ / RTI > The method according to claim 1, The support film may be formed of at least one selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate, polymethly methacrylate (PMMA), polycarbonate, polystyrene, polyolefin, cellulose acetate cellulose acetate, and polyvinyl chloride. The method according to claim 1, Wherein the support film comprises aluminum (Al), copper (Cu), nickel (Ni), silver (Ag), or graphite. The method according to claim 1, Wherein the pattern is an elliptical pattern, a polygon pattern, a prism pattern, or a lenticular pattern. The method according to claim 1, Wherein the light source is a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp, or a light emitting diode (LED). delete

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