KR20130070042A - Optical sheet and backlight unit having the same - Google Patents

Abstract

PURPOSE: An optical sheet and a backlight unit including the same are provided to prevent scratches due to friction and interference by using the uppermost optic layer made of an elastic material. CONSTITUTION: A backlight unit includes a light source and optical sheets(110). The base layer(114) of the optical sheet is made of a material of first density. The rear layer(112) of the optical sheet is formed in the lower part of the base layer and has second density higher than the first density. The optical layer(116) of the optical sheet is formed in the upper part of the base layer and made of elastic acrylic or elastic polymer. The elastic intensity of the optic layer is 1000 g or greater.

Description

Optical sheet and backlight unit including same {OPTICAL SHEET AND BACKLIGHT UNIT HAVING THE SAME}

The present invention relates to an optical sheet and a backlight unit including the same capable of improving brightness and durability.

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, liquid crystal display devices are excellent in moving picture display and are most actively used in the fields of notebook computers, monitors, TVs and the like due to their high contrast ratios.

Such a liquid crystal display is an essential component of a liquid crystal panel bonded through a liquid crystal layer between two side-by-side substrates, and realizes a difference in transmittance by changing an arrangement direction of liquid crystal molecules with an electric field in the liquid crystal panel. do.

However, since the liquid crystal panel does not have its own light emitting element, a separate light source is required in order to display the difference in transmittance as an image. To this end, a backlight unit in which a light source is embedded is disposed on the back of the liquid crystal panel.

The backlight unit is classified into a direct type and an edge type according to the position of the light source. The direct type backlight unit directly disposes light emitted from the light source by arranging the light source under the liquid crystal panel. The backlight unit of the side-type type is disposed in the light guide plate below the liquid crystal panel, and the light source is disposed on at least one side of the light guide plate to indirectly emit light emitted from the light source by using the refraction and reflection of the light guide plate. It is a method of supplying to a liquid crystal panel.

The backlight unit includes a plurality of optical sheets including at least one diffusion sheet and a prism sheet in order to improve the brightness of the light emitted from the light source.

However, as the optical sheets are provided in this way, friction occurs between the sheets, scratches are generated, and white spots are generated due to invasion of foreign matter, and light is desired due to wrinkles and mutual interference caused by the penetration of moisture. There is a problem in that the display quality is deteriorated as the luminance of the entire screen is uneven.

Among these problems, each optical sheet may be thickened to prevent friction between the sheets, thereby preventing each optical sheet from flowing. However, as the thickness of the optical sheet becomes thicker, the substrate cost increases and the manufacturing cost of the optical sheet increases. There is a problem that the rise, and further increases the manufacturing cost of the entire liquid crystal display device.

In particular, the liquid crystal display device has recently been used in a wide range of applications such as portable computers, desktop computer monitors, and wall-mounted televisions, and has been actively researched to realize thin and light liquid crystal displays with a large display area. In progress, the increase in the thickness of the optical sheet has a problem of acting as a factor that inhibits the implementation of the thin and lightweight liquid crystal display device.

Accordingly, an object of the present invention for solving the above problems is to have an elastic property and to have a higher transparency and a dense structure to prevent scratches by friction, and to prevent the penetration of foreign matter and moisture and It is to provide a backlight unit including the same.

A backlight unit according to the present invention for achieving the above object, the light source; A base layer comprising a base material having a first density, a backing layer formed by being UV cured under the base layer, and having a second density higher than the first density, and having an elastic acrylic or elasticity on the base layer It includes a plurality of optical sheets formed of a polymer material and composed of an optical layer having an elastic strength of 1000 g or more.

The optical sheet may include a diffusion sheet for diffusing light emitted from the light source, a prism sheet for collecting light diffused through the diffusion sheet, and a dual luminance enhancement film positioned at an upper portion of the prism sheet to improve luminance. And a Brightness Enhancement Film (DBEF) sheet.

The base layer has a haze value of 1% or less, and the back layer has a haze value of 2% or less.

The back layer is made of one of the UV curable acrylic resin, polyurethane, fluorocarbon resin, silicon resin and epoxy resin, characterized in that the moisture content is 0.5 wt% or less.

On the other hand, the optical sheet according to a preferred embodiment of the present invention, the base layer made of a substrate having a first density; A back layer formed under the base layer by UV curing and having a second density higher than the first density; The optical layer is formed of a polymer material having elastic acrylic or elasticity on the base layer and has an elastic strength of 1000g or more.

As described above, according to the present invention, by implementing the uppermost optical layer made of an elastic material, it is possible to prevent scratches due to friction and interference, and to prevent foreign matter from entering.

And by forming the base layer which is a base base material into the base material whose haze value is 1% or less, transparency can be improved and brightness can be improved.

In addition, UV curing of the lowermost back layer improves the compactness of the inter-tissue bonds and prevents moisture from penetrating from the outside.

As such, by changing the material of each layer constituting the optical sheet or by changing the manufacturing method, the reliability of the optical sheet can be improved and the optical properties of the optical sheet can be improved.

1 is a cross-sectional view showing an optical sheet according to a preferred embodiment of the present invention.
2 is a view showing an optical sheet manufacturing equipment according to a preferred embodiment of the present invention.
3A is a view showing in detail the base layer of the optical sheet according to the first comparative example.
Figure 3b is a view showing in detail the base layer of the optical sheet according to a preferred embodiment of the present invention.
Figure 4a is a view showing in detail the back layer of the optical sheet according to the second comparative example.
Figure 4b is a view showing in detail the back layer of the optical sheet according to a preferred embodiment of the present invention.
5 is an exploded perspective view showing a liquid crystal display module according to an embodiment of the present invention.
6 is an exploded perspective view showing a liquid crystal display module according to another embodiment of the present invention.

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

1 is a cross-sectional view showing an optical sheet according to a preferred embodiment of the present invention.

As illustrated in FIG. 1, the optical sheet 110 corresponds to a prism sheet in which a rear layer 112, a base layer 114, and an optical layer 116 are sequentially formed.

Here, the back layer 112 is a layer formed under the base layer 114, and serves to improve adhesion with the member to be interposed thereunder.

For example, the back layer 112 may form a gap between the prism sheet 110 and a diffusion sheet or other member (for example, a light guide plate or a diffusion plate) provided below the prism sheet 110 and the diffusion sheet. It is possible to prevent the appearance defects caused by the wet-out phenomenon and moiré pattern generated on the display screen that can be caused by sticking together.

The back layer 112 for this purpose is made of a binder resin, the binder resin may be UV curable acrylic resin (acryl resin), polyurethane (polyurethane), fluorine resin (fluorine resin), silicon resin (silicon resin), An epoxy resin etc. can be used.

The back layer 112 is UV cured after applying the binder resin, characterized in that formed in a dense structure.

In this case, the back layer 112 may have a haze value of 2% or less indicating a scattering degree of transmitted or reflected light.

The base layer 114 corresponds to a base film serving as a base, and is characterized by being made of a transparent substrate having a haze value of 1% or less.

The transparent substrate is most preferably made of polyethylene terephthalate (PET) having a haze value of 1% or less, but is not limited thereto. Polyethersulphone (PES) having a haze value of 1% or less, polyacryl Polyacrylate (PAR), polyetherimide (PEI), polyethylene napthalate (PEN), polyphenylene sulfide (PPS), polyallylate, polyimide, It may be made of polycarbonate (PC), cellulose triacetate (TAC) or cellulose acetate propinonate (CAP).

The optical layer 116 is a layer formed on the base layer 114, and includes a plurality of prism patterns 117 formed of elastic acrylic or elastic polymer material.

Accordingly, in the case of the optical layer made of general acrylic, the acid strength indicating the elastic recovery power is about 100 to 150 g, whereas in the case of the optical layer 116 made of the elastic acrylic according to the present invention, the elastic strength is 1000 g or more. It is characterized by an improvement.

This allows the optical layer 116 to be restored while maintaining its original shape without surface damage even when pressure is applied from the outside. That is, the damage of the prism pattern 117 due to the scratch generated by external pressure or friction is prevented, thereby preventing the luminance deterioration due to the damaged prism pattern 117, and preventing foreign matter invading through the separation space formed by the pressing. You can do it.

Here, the plurality of prism patterns 117 are formed by a plurality of first and second inclined surfaces 117a and 117b which are symmetrical with each other, and the cross-sections thereof are formed in a triangular shape and are repeatedly arranged in the first direction to be adjacent to each other.

Accordingly, the plurality of prism patterns 117 are repeated with the peaks 118 and the valleys 119 in the first direction, and the peaks 118 and the valleys 119 extend in the second direction crossing the first direction. .

Since the plurality of prismatic patterns 117 are made of elastic acrylic, the strength of the acid 118 is 1000 g or more.

On the other hand, the optical layer 116 as an embodiment of the present invention has been described by showing a prism pattern 117, which is one of the light collecting patterns as a light collecting layer for condensing light, but is not limited thereto. A condensing pattern, such as a lenticular pattern, whose cross section is semi-circular or semi-elliptical, may be formed.

In addition, instead of the optical layer 116 as an embodiment of the present invention, it can be applied to a diffusion sheet or a functional sheet in which a diffusion layer including beads for diffusing light or a functional layer other than that is applied to the elastic acrylic.

2 is a view showing the optical sheet manufacturing equipment according to a preferred embodiment of the present invention, see FIG.

As shown in FIG. 2, the manufacturing apparatus 150 for the optical sheet includes a stage 151, a resin supply unit 152, and a UV irradiation unit 156.

The stage 151 is a place where the base film 114 is seated, and serves to move the base film 112 so that the back layer 116 may be formed on the base film 114.

Here, the base film 112 may be continuously supplied to the stage 151 while being rolled up and rolled up.

The resin supply unit 152 discharges a predetermined amount of the photocurable resin 154 through the discharge port 153 so that the photocurable resin 154 having a predetermined thickness is applied to the base film 114.

The photocurable resin 154 may be an acrylic resin, polyurethane, fluorine resin, silicon resin, epoxy resin, or the like.

Through this, the base film 114 to which the photocurable resin 154 is applied is transferred to the UV irradiation unit 156, and the UV irradiation unit 156 applies UV to the base film 114 to which the photocurable resin 154 is applied. By irradiating and hardening the photocurable resin 154, the back layer 112 is formed in the back surface of the base film 112. FIG.

On the other hand, the optical layer 116 of the optical sheet according to the present invention can also be manufactured through the optical sheet manufacturing equipment, in this case, the optical sheet manufacturing equipment is a condensing pattern of the acid and valley repeated on the surface to form a band-like protruding The formed roller part (not shown) is further included between the resin supply part 152 and the UV irradiation part 156. Accordingly, the roller unit (not shown) may rotate clockwise or counterclockwise as the base film coated with the curable resin is transferred through the stage, and the light collecting pattern may be formed on the entire surface of the base film 112.

Here, although the rear layer is first formed on the base substrate of the optical sheet, the present invention is not limited thereto, and the optical layer may be formed first. This is because the optical layer according to the present invention is made of an elastic material, so that surface damage of the pattern due to pressing and friction can be prevented.

Hereinafter, an optical sheet as a comparative example for comparing with an optical sheet according to an embodiment of the present invention will be described with reference to the drawings. Here, it is assumed that the base layer of the optical sheet according to the comparative example is 2% to which the haze value is normally applied.

3A is a view showing in detail the base layer of the optical sheet according to the first comparative example, Figure 3b is a view showing in detail the base layer of the optical sheet according to a preferred embodiment of the present invention.

First, as shown in FIG. 3A, the base layer 14 of the first comparative example is made of polyethylene terephthalate (PET) including a plurality of first scattering particles 14a having different diameters.

On the other hand, as shown in Figure 3b, the base layer 114 of the embodiment is characterized in that made of polyethylene terephthalate (PET) including a plurality of second scattering particles (114a) having a different diameter.

The base layer 114 of this embodiment is characterized in that a plurality of second scattering particles 114a are distributed along the edge of the base layer 114 with a haze value of 1% or less than the first comparative example.

In this case, the second scattering particles 114a included in the base layer 114 of the embodiment have a diameter smaller than that of the first scattering particles 14a and are included in a smaller number so that the density of the scattering particles is smaller than that of the first comparative example. Accordingly, the transparency of the base layer 114 of the embodiment is higher than that of the first comparative example.

Through this, the base layer 114 of the embodiment can play a role of improving luminance by transmitting more light incident through the back layer 112 of FIG. 1.

That is, the base layer 114 of the embodiment 110 is characterized by improving the luminance by increasing the transmittance of light by applying polyethylene terephthalate having a high transparency while lowering the haze value.

4A is a view showing in detail the back layer of the optical sheet according to the second comparative example, Figure 4B is a view showing in detail the back layer of the optical sheet according to a preferred embodiment of the present invention.

First, as shown in FIG. 4A, the second comparative example includes a rear layer 12 under the base layer 14 to improve adhesion with the lower substrate.

The back layer 12 is formed by applying a binder resin and then heat curing to form a predetermined gap between the tissues by intertwining the tissues.

The back layer 12 of the second comparative example has a moisture content of 1 wt% or less. Accordingly, the external moisture (H ₂ O, 20) is partially reflected by the tissue of the back layer 12 is not penetrated, but some penetrates into the back layer 12, some of the through the back layer 12 Penetrates into the base layer 14. As the moisture 20 penetrates into the sheet as described above, wrinkles are generated in the sheet, and the wrinkles do not implement uniform luminance on the entire screen and the image quality is deteriorated.

On the other hand, as shown in FIG. 4B, the embodiment includes a back layer 112 below the base layer 114 to improve adhesion to the lower substrate, similar to the second comparative example.

The back layer 112 is formed by applying UV curing after applying the binder resin, the tissue is more tightly entangled and the spacing between the tissues to maintain a narrower gap than the back layer 12 of the second comparative example.

That is, the back layer 112 of the embodiment is characterized in that the adhesion between the tissue is improved by being formed by UV curing (curing).

Accordingly, the back layer 112 of the embodiment has a moisture content of 0.5 wt% or less.

As described above, the back layer 112 of the embodiment has better moisture content than the back layer 12 of the second comparative example, thereby preventing external moisture 20 from penetrating into the back layer 112 and the base layer 114. Wrinkles can be prevented due to the penetration. Through this, the luminance of the entire screen can be realized uniformly and the image quality can be improved.

In addition, the back layer 112 of the embodiment has the advantage of preventing the intrusion of foreign matter by reducing the separation interval with the lower member. This is because the protruding height of the tissue protruding from the back layer 112 is smaller than that of the back layer 112 of the second comparative example as the spacing between the tissues constituting the back layer 112 is tight.

Accordingly, the back layer 112 of the embodiment is improved in the compactness of the bonding not only has a more robust characteristics than the back layer 12 of the second comparative example, but also reduces the separation distance with the lower member, while the adhesion to the member to be interposed thereunder It is possible to prevent the appearance defect due to the wet-out phenomenon that may be caused by sticking together and the moiré pattern generated on the display screen.

Hereinafter, the liquid crystal display module to which the optical sheet as described above is applied will be described with reference to the drawings.

FIG. 5 is an exploded perspective view showing a liquid crystal display module according to an exemplary embodiment of the present invention. Referring to FIG.

As shown in FIG. 5, the liquid crystal display module 200 includes a liquid crystal panel 210, a backlight unit 220, and a support main 230 for modularizing the liquid crystal panel 210 and the backlight unit 220. And cover bottom 250 and top cover 240.

The liquid crystal panel 210 plays a key role in image expression, and is composed of first and second substrates 212 and 214 bonded to each other with a liquid crystal layer interposed therebetween.

Although not shown in the drawings, a plurality of gate lines and data lines intersect on the inner surface of the first substrate 212, which is commonly referred to as a lower substrate or an array substrate, under the premise of an active matrix scheme, and pixels are defined at each intersection. A thin film transistor (TFT) is provided to correspond one-to-one with a transparent pixel electrode formed in each pixel.

In addition, the inner surface of the second substrate 214 called the upper substrate or the color substrate includes, for example, color filters of red (R), green (G), and blue (B) colors, A black matrix covering each other and covering non-display elements such as gate lines, data lines, and thin film transistors, and transparent common electrodes covering them are provided. The transparent common electrode may be formed on the first substrate 212.

First and second polarizing plates (not shown) for selectively transmitting only specific light are attached to the outer surfaces of the first and second substrates 212 and 214, respectively.

In addition, the printed circuit board 217 is connected through at least one edge of the liquid crystal panel 210 via a connecting member 216 such as a flexible circuit board or a tape carrier package (TCP). At the side of the support main 230 or the cover bottom 250 may be appropriately folded close to the back.

Accordingly, the liquid crystal panel 210 having the above-described structure is configured to have a data driving circuit when the thin film transistor selected for each gate line is turned on by an on or off signal of a gate driver circuit transmitted through the printed circuit board 217. The signal voltage is transmitted to the corresponding pixel electrode through the data line, and the arrangement direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode, thereby indicating a difference in transmittance.

The back of the liquid crystal panel 210 is provided with a backlight unit 220 for supplying light to display the difference in transmittance as an image.

The backlight unit 220 includes a light source arranged along an edge of the support main 230, a reflector 225, a light guide plate 223 seated on the reflector 225, and a plurality of optical sheets interposed thereon. 221.

As a light source, an LED 229a is used. Each of the plurality of LEDs 229a is spaced at regular intervals and mounted on a printed circuit board (PCB) 229b to form an LED assembly 229.

Meanwhile, a fluorescent lamp may be used instead of the LED assembly 229, and when the fluorescent lamp is used, a lamp guide may be further included to protect and guide the outside of the fluorescent lamp and to concentrate light toward the light guide plate 223.

The LED assembly 229 is fixed in a position such as by bonding such that the light emitted from the plurality of LEDs 229a faces the light incident surface of the light guide plate 223.

Since the LED driver integrated circuit (IC) (not shown) for driving the LED assembly 229 is provided, the light emitted from the plurality of LEDs 229a by the LED driver integrated circuit (not shown) is light guide plate. It is supplied to the liquid crystal panel 210 indirectly by using the refraction and reflection at 223.

The reflection plate 225 is disposed on the rear surface of the light guide plate 223 to reflect the light passing through the rear surface of the light guide plate 223 toward the liquid crystal panel 210 to improve the brightness of the light.

The light guide plate 223 evenly spreads the light incident from each of the plurality of LEDs 229a to a wide area of the light guide plate 223 while traveling in the light guide plate 223 by a plurality of total reflections, thereby providing a surface light source to the liquid crystal panel 210. Be sure to

The light guide plate 223 may include a pattern of a specific shape on the back surface to supply a uniform surface light source. The pattern may be configured in various ways such as an elliptical pattern, a polygon pattern, a hologram pattern, and the like to guide the light incident to the light guide plate 223. The lower surface of the 123 may be formed by a printing method or an injection method.

The plurality of optical sheets 221 mounted on the light guide plate 223 may diffuse or collect light converted by the light guide plate 223 into the surface light source so that a more uniform surface light source is incident on the liquid crystal panel 210.

The plurality of optical sheets 221 may include, for example, a diffusion sheet 221a for diffusing light, at least one prism sheet 221b for condensing light, and a dual brightness enhancement film for increasing luminance. It may be made of a functional optical sheet 221c such as film: DBEF).

Each of the diffusion sheet 221a, the prism sheet 221b, or the functional optical sheet 221c may have a back layer 112 formed by UV curing from the bottom to the top, as in FIG. It is characterized in that the layer 114 and the optical layer 116 made of elastic acrylic. Here, the optical layer 116 may correspond to a diffusion layer including beads in the case of a diffusion sheet, an optical layer including a light collecting pattern in the case of a prism sheet, and may correspond to a functional layer in the case of a double luminance enhanced film sheet.

The liquid crystal panel 210 and the backlight unit 220 described above are modularized through the top cover 240, the support main 230, and the cover bottom 250.

More specifically, the liquid crystal panel 210 and the backlight unit 220 have a top cover 240 covering the top edge of the liquid crystal panel 210 in a state where the edge is surrounded by the support main 230 having a rectangular frame shape, and the backlight unit. The cover bottom 250 covering the rear surface is coupled to each other in front and rear and is integrated and modularized through the support main 230.

As it is modularized, light emitted from each of the plurality of LEDs 229a of the backlight unit 220 is incident on the light incident surface of the light guide plate 223, and then refracted toward the liquid crystal panel 210 therein, and the reflecting plate While passing through the plurality of optical sheets 221 with the light reflected by 225 is processed into a more uniform high-quality surface light source is supplied to the liquid crystal panel 210.

FIG. 6 is an exploded perspective view showing a liquid crystal display according to another exemplary embodiment of the present invention. Referring to FIG.

As illustrated in FIG. 6, the liquid crystal display device 300 includes a liquid crystal panel 310, a backlight unit 320, a support main 330, a cover bottom 350, and a top cover 340.

The backlight unit 320 includes a plurality of LED assemblies 329, a reflecting plate 325, a diffuser plate 324 positioned at a predetermined interval above the reflecting plate 325, and a diffusion plate 324. It includes a plurality of optical sheets 321 interposed thereon.

The LED assembly 329 is formed by mounting each of the plurality of LEDs 329a on a printed circuit board (PCB) 329b spaced apart at regular intervals.

The LED assembly 329 is arranged a plurality of spaced apart at regular intervals in the longitudinal direction or the perpendicular direction of the cover bottom 350.

Here, the printed circuit board 329b on which the plurality of LEDs 329a are mounted may correspond to a metal core printed circuit board having a heat dissipation function, and the back of the metal core printed circuit board A heat sink (not shown) may be provided to allow heat generated from each of the plurality of LEDs 329a to be discharged to the outside.

The LED assembly includes a reflector plate 325 in which a plurality of reflecting through holes 325a are formed to correspond to each of the plurality of LEDs 329a included in the plurality of LED assemblies 329. The printed circuit board 329b of 329 is mounted on the upper portion of the printed circuit board 329b.

Accordingly, each of the plurality of LEDs 329a of the LED assembly 329 passes through and is exposed through each of the plurality of reflecting through holes 325a of the reflecting plate 325.

The reflective plate 325 is a white or silver plate covering the entire inner surface of the printed circuit board 329b and the cover bottom 350 except for each of the plurality of LEDs 329a through the plurality of reflective through holes 325a. Some of the light emitted from each of the LEDs 329a is directed toward the cover bottom 350 to be reflected toward the liquid crystal panel 310.

On the upper side of the reflecting plate 325, the diffusion plate 324 for diffusing the light emitted from each of the plurality of LEDs 329a to maintain the uniformity of the brightness is positioned at a predetermined interval.

The gap between the reflector plate 325 and the diffuser plate 324 is defined as an optical gap or an air gap, which is a gap required to diffuse light emitted from each of the plurality of LEDs 329a. .

A plurality of optical sheets 321 are interposed to diffuse and collect light to the upper portion of the diffusion plate 324 such that a more uniform surface light source is incident on the liquid crystal panel 310.

The plurality of optical sheets 321 may include, for example, a diffusion sheet 321a for diffusing light, at least one prism sheet 321b for condensing light, and a dual brightness enhancement film for increasing luminance. It may be made of a functional optical sheet 321c such as film: DBEF.

The diffusion sheet 321a, the prism sheet 321b, or the functional optical sheet 321c, as shown in FIG. 1, has a back layer 112 formed by UV curing from the bottom to the top thereof, and a base having a haze value of less than 1%. It is characterized in that the layer 114 and the optical layer 116 made of elastic acrylic. Here, the optical layer 116 may correspond to a diffusion layer including beads in the case of a diffusion sheet, an optical layer including a light collecting pattern in the case of a prism sheet, and may correspond to a functional layer in the case of a double luminance enhanced film sheet.

Accordingly, the light emitted from each of the plurality of LEDs 329a disposed under the liquid crystal panel 310 is overlapped and mixed with each other by the reflecting plate 325, the diffusion plate 324, and the plurality of optical sheets 321. The liquid crystal panel 310 is incident as the surface light source, and the liquid crystal panel 310 displays a high brightness image to the outside by using the same.

The liquid crystal panel 310 and the backlight unit 320 are modularized through the top cover 340, the support main 330, and the cover bottom 350. The top cover 340 is the top and side surfaces of the liquid crystal panel 310. A rectangular frame having a cross section bent in a shape so as to cover an edge thereof is configured to display an image implemented in the liquid crystal panel 310 by opening the front surface of the top cover 340.

In addition, the cover bottom 350, which is the basis for assembling the entire apparatus of the liquid crystal display module 300 by mounting the liquid crystal panel 310 and the backlight unit 320, has a cover shape 350 having a rectangular plate shape. It may include a pair of bar-shaped side support (351) coupled to the opposite opposite edges of the (bar).

In addition, the other two edges of the cover bottom 350 except for the side support 351 may be bent upward so as to have the same height as these, thereby forming a predetermined space in which the backlight unit 320 may be seated.

Accordingly, the liquid crystal panel 310 and the backlight unit 320 have a top cover 340 covering the top edge of the liquid crystal panel 310 in a state where the edge is surrounded by the support main 330 having a rectangular frame shape, and the backlight unit 320. Cover cover 350 to cover the back of the) is respectively coupled to the front and rear is integrated and modularized via the support main 330.

The light emitted from each of the plurality of LEDs 329a of the backlight unit 320 in the modular liquid crystal display module 300 is diffused along with the light reflected by the reflector 325 and the plurality of optical fibers. While passing through the sheets 321, the surface light source is processed into a more uniform surface light source and is supplied to the liquid crystal panel 310.

Meanwhile, the top covers 240 and 340 may also be referred to as case tops or top cases, and the support mains 230 and 330 may also be referred to as guide panels or main supports and mold frames, and the cover bottoms 250 and 350 are bottoms. It is also called a cover.

The embodiments of the present invention as described above are merely illustrative, and those skilled in the art can make modifications without departing from the gist of the present invention. Accordingly, the protection scope of the present invention includes modifications of the present invention within the scope of the appended claims and equivalents thereof.

110: optical sheet 112: back layer
114: base layer 116: optical layer
117: prism pattern 220, 320: backlight unit

Claims (7)

A light source;
A base layer comprising a base material having a first density, a backing layer formed by being UV cured under the base layer, and having a second density higher than the first density, and having an elastic acrylic or elasticity on the base layer A backlight unit comprising a plurality of optical sheets formed of a polymer material and composed of an optical layer having an elastic strength of 1000 g or more.
The method of claim 1,
Many of the optical sheets
A diffuser sheet for diffusing light emitted from the light source, a prism sheet for collecting light diffused through the diffuser sheet, and a dual brightness enhancement film (DBEF) positioned above the prism sheet to improve luminance Backlight unit comprising a sheet.
The method of claim 1,
The base layer has a haze value of 1% or less, and the back layer has a haze value of 2% or less.
The method according to claim 1 or 3,
The back layer is
The back light unit is made of one of the UV curable acrylic resin, polyurethane, fluorocarbon resin, silicon resin and epoxy resin, the moisture content is 0.5 wt% or less.
A base layer comprising a base material having a first density;
A back layer formed under the base layer by UV curing and having a second density higher than the first density;
An optical sheet comprising an optical layer having an elastic strength of 1000g or more formed of a polymer material having elastic acrylic or elasticity on the base layer.
6. The method of claim 5,
The base layer has a haze value of 1% or less, and the back layer has a haze value of 2% or less.
The method according to claim 5 or 6,
The back layer is
The optical sheet is made of one of the acrylic resin, polyurethane, fluorine resin, silicon resin and epoxy resin capable of UV curing, the moisture content is 0.5 wt% or less.

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