KR20120082560A - Backlight assembly and manufacturing method thereof - Google Patents

Backlight assembly and manufacturing method thereof Download PDF

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Publication number
KR20120082560A
KR20120082560A KR1020110003898A KR20110003898A KR20120082560A KR 20120082560 A KR20120082560 A KR 20120082560A KR 1020110003898 A KR1020110003898 A KR 1020110003898A KR 20110003898 A KR20110003898 A KR 20110003898A KR 20120082560 A KR20120082560 A KR 20120082560A
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KR
South Korea
Prior art keywords
micro pattern
light
optical sheet
backlight assembly
retroreflective optical
Prior art date
Application number
KR1020110003898A
Other languages
Korean (ko)
Inventor
임용진
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임용진
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Publication date
Application filed by 임용진 filed Critical 임용진
Priority to KR1020110003898A priority Critical patent/KR20120082560A/en
Publication of KR20120082560A publication Critical patent/KR20120082560A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0025—Diffusing sheet or layer; Prismatic sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

A high quality backlight assembly with high light efficiency and minimal thickness and a method of manufacturing the same are proposed. The proposed backlight assembly includes a light guide plate including a light source, a light guide plate that guides the light from the light source to a light exit surface, and a reflector that reflects light on an opposite side of the light exit surface, and is formed on an upper surface of the light guide plate to diffuse light. And a retroreflective optical sheet on which a micropattern is transferred on at least one surface of the plate and the diffusion plate side.

Description

Backlight assembly and manufacturing method thereof

The present invention relates to a backlight assembly and a method for manufacturing the same, and more particularly, to a high quality backlight assembly with a high light efficiency and a minimum thickness and a method for manufacturing the same.

In the information display technology, the display device has occupied a position that CRT has been unique for more than half a century, but in the rapidly evolving information age, a larger and thinner display technology is required. As a result, flat panel display technology that can be enlarged and thinned has been developed. Liquid crystal display (LCD), projection display, and plasma display (PDP) have become mainstream, and field emission display (FED) and electroluminescent display ( ELD) has been developed along with the improvement of related technologies.

Compared with CRTs, LCDs are flat and large in size, and thus their use is expanding in display fields such as monitors and TVs, accounting for 80% of the flat panel market. The LCD includes a panel in which a liquid crystal and an electrode matrix are disposed between a pair of light absorbing optical films. In an LCD, the liquid crystal portion moves the liquid crystal portion by an electric field generated by applying a voltage to two electrodes, thereby having an optical state that is changed, and displaying an image using a polarized light in a specific direction. . Thus, the LCD includes a front optical film and a back optical film that induce polarization.

Since the LCD is not a self-luminous display, but a non-luminous display, it uses a light generated from the backlight including the backlight. The light emitted from the backlight passes through the liquid crystal panel, and at this time, light absorption by various components such as an optical film is issued, resulting in low light utilization efficiency. In order to increase light utilization efficiency, an optical sheet for improving brightness is positioned between the backlight and the liquid crystal panel.

A retroreflective optical sheet may be used as the optical sheet for improving luminance. The retroreflective optical sheet transmits part of light emitted from the backlight and reflects part of the optical sheet back to the optical sheet by the reflector on the backlight to improve light efficiency. Increase In order to further improve the light efficiency of the retroreflective optical sheet, several separate optical sheets may be attached and used. However, in general, since the optical sheet is provided with the base layer, when the optical sheet is added, unnecessary substrate layers necessarily provided with each optical sheet may be stacked together. Therefore, it has been pointed out that a problem that adversely affects the increase in light efficiency due to the increase in thickness due to the unnecessary substrate layer and the optical loss due to the optical properties of the substrate layer material.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a high quality backlight assembly with a high light efficiency and a minimum thickness and a manufacturing method thereof.

The backlight assembly according to an aspect of the present invention for achieving the above object is a light source; A light guide plate for guiding the light from the light source to the emission surface and including a reflection plate reflecting light on an opposite surface of the emission surface; A diffusion plate formed on an upper surface of an emission surface of the light guide plate to diffuse light; And a retroreflective optical sheet having a micro pattern transferred to at least one surface formed on an emission surface side of the diffusion plate.

The micro pattern may be at least one of a positive lens type, a negative lens type, and a prism type, and the micro pattern may include a UV curable resin. In this case, the refractive index of the UV curable resin may be 1.46 to 1.48, or the refractive index of the UV curable resin may be 1.55 to 1.57.

It is preferable that the thickness of a micropattern is 5-25 micrometers.

According to another aspect of the invention, the step of having a light source on one surface, the diffusion plate for diffusing the light on the light guide plate for guiding the light exit from the light source to the upper surface of the light emitting plate; And positioning a retroreflective optical sheet on which at least one surface of the micropattern has been transferred is located on the emission surface side of the diffuser plate.

Applying a retro-reflective optical sheet to one surface of the UV curable resin; Contacting the micro pattern mold corresponding to the shape of the micro pattern with the UV curable resin; Irradiating UV; And separating the micro pattern mold; the micro pattern may be transferred onto one surface. At this time, the micro pattern mold to form a micro pattern master of the same shape as the micro pattern; And forming a micro-pattern mold using the micro-pattern master. The micro pattern mold may be formed from the micro pattern master using a pre-plating method or a soft molding method.

The retroreflective optical sheet may further include pressing and heating a micro pattern mold corresponding to the shape of the micropattern to closely adhere to the retroreflective optical sheet; And separating the micro pattern mold; the micro pattern may be transferred onto one surface. At this time, the heating temperature may be 90 ℃ to 120 ℃.

The backlight assembly according to the present invention includes a micro pattern transferred directly onto the retroreflective optical sheet, so that the light loss can be minimized while the thickness of the backlight assembly can be minimized.

1 is a cross-sectional view of a backlight assembly according to an embodiment of the present invention.
2A through 2E are cross-sectional views of a retroreflective optical sheet according to various embodiments of the present disclosure.
3A to 3C are views provided to explain a method of manufacturing a retroreflective optical sheet in a method of manufacturing a backlight assembly according to an embodiment of the present invention.
4A to 4C are views provided to explain a method of manufacturing a retroreflective optical sheet in a method of manufacturing a backlight assembly according to another embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. In the accompanying drawings, there may be a component having a specific pattern or having a predetermined thickness, but this is for convenience of description or distinction. It is not limited only.

1 is a cross-sectional view of a backlight assembly according to an embodiment of the present invention. The backlight assembly 100 according to the embodiment of the present invention includes a light source 110; A light guide plate 130 which guides the light from the light source 110 to an exit surface to emit light, the reflector 120 reflecting light on an opposite surface of the exit surface; A diffusion plate 140 formed on an upper surface of an emission surface side of the light guide plate 130 to diffuse light; And a retroreflective optical sheet 150 having a micro pattern 160 transferred to at least one surface formed on an emission surface side of the diffusion plate 140.

The light source 110 is for supplying light from the back of the display device. For example, a light source such as a cold cathode fluorescent lamp (CCFL) or a light emitting diode (LED) may be used. . The light source 110 may be located on one surface of the light guide plate 130 as shown in FIG. 1, and may be located on various surfaces of the light guide plate 130. In FIG. 1, the light source 110 is illustrated in the form of an edge type backlight that is located on one side of the light guide plate 130, but the light source 110 is located directly on the opposite side of the light exit surface, that is, on the lower surface of the light guide plate. It may also be implemented in the form of a backlight.

The light guide plate 130 is made of a transparent resin and guides the light from the light source 110 to the emission surface to uniformly transmit the light to the entire display device. On the opposite side of the exit surface of the light guide plate 130 is provided with a reflecting plate 120 for reflecting light traveling toward the opposite surface side of the exit surface to the exit surface side. A diffusion plate 140 is disposed on the emission surface side of the light guide plate 130 to uniformly diffuse the light traveling from the light guide plate 130.

The retroreflective optical sheet 150 is positioned on the diffuser plate 140. As the light is absorbed while passing through various components from the light source to the display panel, light utilization efficiency is lowered. Accordingly, the light reflection efficiency may be improved by placing the retroreflective optical sheet 150 on the diffuser plate 140 to improve luminance.

The retroreflective optical sheet 150 returns the light back to the light guide plate 130, and the light propagated to the light guide plate 130 is reflected by the reflector 120 at the rear side and then reenters the retroreflective optical sheet 150. do. The re-incident light may be converted into optical characteristics in the light guide plate 130 and the reflector 120 to pass through the retroreflective optical sheet 150 to the display panel.

The micro pattern 160 is transferred to at least one surface of the retroreflective optical sheet 150. The micro pattern 160 is a micro-sized optical pattern and is formed in an embossed or intaglio form to diffuse and collect light. The micro pattern 160 may be in the form of a prism as shown in FIG. 1, or alternatively, may be a lens.

The micro pattern 160 is preferably 'directly transferred' to the surface of the retroreflective optical sheet 150. In order to form the micropattern 160 on the retroreflective optical sheet 150, there is a method of forming the micropattern 160 separately and attaching it to the retroreflective optical sheet 150. In order to form the micro-pattern 160 separately, a micro-pattern may be formed on the base layer. In this case, when the micro-pattern 160 is attached on the retroreflective optical sheet 150, the overall thickness is the base layer. It will be thick including. Since the substrate layer is usually 200 to 300 μm, the thickness of the entire backlight assembly becomes thick.

Therefore, when the microreflective pattern 160 is directly transferred to the retroreflective optical sheet 150, the substrate layer is unnecessary, so that the thickness can be minimized. In the case of the direct type backlight assembly, since the light source is located on the lower surface of the light guide plate, there is a problem in that the thickness is increased compared to the edge type backlight assembly. I can eliminate it. In addition, the light efficiency can also be maximized by fundamentally blocking the possibility that the substrate layer can absorb light.

2A through 2E are cross-sectional views of a retroreflective optical sheet according to various embodiments of the present disclosure. In the present invention, at least one surface of the retroreflective optical sheet may transfer a micro pattern that collects and diffuses light, and the micro pattern may have a lens shape or a prism shape.

In FIG. 1, the prism-shaped micropattern 160 is transferred to the emission surface side surface of the retroreflective optical sheet 150, that is, the upper surface in the drawing. In another embodiment of FIG. 2A, a lens-shaped micro pattern 261 is illustrated on one surface of the retroreflective optical sheet 251. In FIG. 2B, the micro patterns 262 and 263 are transferred to both surfaces of the retroreflective optical sheet 252. A positive microlens pattern 262 is transferred onto an upper surface of the retroreflective optical sheet 252 of FIG. 2B, and a negative microlens pattern 263 is transferred onto a lower surface thereof.

In the retroreflective optical sheet 253 of FIG. 2C, microprism patterns 264 and 265 are formed on both surfaces. On the contrary, micropatterns 266 and 267 having different shapes are formed on both surfaces of the retroreflective optical sheet 254 of FIG. 2D. On the upper surface of the retroreflective optical sheet 254 of FIG. 2D, a positive microlens pattern 266 is formed, and on the lower surface, a microprism pattern 267 is formed. Similarly, different patterns of micro patterns 268 and 269 are formed on both surfaces of the retroreflective optical sheet 255 of FIG. 2E, and a micro prism pattern 268 is formed on an upper surface thereof and a negative micro form on a lower surface thereof. The lens pattern 269 is formed.

2A to 2E, when transferring the micropatterns of various shapes onto the retroreflective optical sheet, the light collecting and light diffusing functions of the micropatterns according to the shapes may be selected and implemented. In addition, the micro-patterns having different shapes may be transferred onto the upper and lower surfaces of the retroreflective optical sheet, thereby retaining functions corresponding to the micro-patterns. In FIGS. 2A to 2E, one shape of the micropattern is transferred to one surface of the retroreflective optical sheet, but various shapes of the micropattern may be transferred onto one plane. A process of transferring the micropattern on the retroreflective optical sheet will be described below with reference to FIGS. 3A to 3C.

According to an embodiment of the present invention, the method includes: providing a light source on one surface and placing a diffuser plate on an emission surface side of the light guide plate to diffuse light onto the light guide plate that guides the light from the light source to the emission surface; And positioning a retroreflective optical sheet on which at least one surface of the micropattern has been transferred is located on the emission surface side of the diffuser plate.

In this embodiment, in order to manufacture the backlight assembly, the light source is first placed on one surface of the light guide plate. The light source is positioned at the side of the light guide plate in the case of the edge type according to the type of the backlight assembly, and on the opposite side of the emission surface, which is the surface from which light is emitted, in the case of the direct type. A diffuser plate is positioned on the exit surface side of the light guide plate so that the light is uniformly distributed.

The retroreflective optical sheet is placed on the top of the diffuser plate. In the retroreflective optical sheet, a micro pattern is transferred onto at least one surface.

3A to 3C are views provided to explain a method of manufacturing a retroreflective optical sheet, in particular, in a method of manufacturing a backlight assembly according to an embodiment of the present invention. The method of transferring the micropattern on the retroreflective optical sheet may be any method as long as the substrate layer for the micropattern is not added and the micropattern is directly formed on the retroreflective optical sheet. It uses UV imprinting, which is relatively simple and allows for accurate pattern formation at low cost. In the UV imprinting method, a pattern is formed using a UV curable material, and UV is cured by irradiating UV to form a micro pattern.

In FIG. 3A, a UV curable resin is coated on the retroreflective optical sheet 350 to form a UV curable resin layer 370. UV curable resin is resin which hardens when irradiated with UV. In this case, the refractive index of the UV curable resin may be determined in consideration of the shape of the micro pattern to be formed later, the light concentration function or the light diffusion function, preferably 1.46 to 1.48, or 1.55 to 1.57.

The micro pattern mold 380 corresponding to the shape of the micro pattern is positioned on the UV curable resin layer 370. The micro pattern mold 380 is preferably transparent in consideration of the UV irradiation process. The shape of the micro pattern mold 380 'corresponds to the shape of the micro pattern. The term 'corresponding' to the shape of the micropattern means that the shape is not the same as the shape of the micropattern, but the shape for forming the micropattern. That is, when the micro pattern mold 380 is in close contact with the UV curable resin layer 370 to form a micro pattern, the micro pattern mold 380 has a shape that can leave a micro pattern shape on the UV curable resin layer 370.

The micro pattern mold 380 first forms a micro pattern master (not shown) having the same shape as the micro pattern to be formed on the retroreflective optical sheet 350, and then performs a pre-plating method from the micro pattern master (not shown). Alternatively, it may be obtained by forming a replica of the reverse phase through a replication process such as a soft molding method. The micro pattern master (not shown) may be referred to as a type of mold having a micro pattern using a process capable of realizing a pattern shape such as machining and photolithography.

When the micro pattern mold 380 is mounted on the UV imprinting apparatus, the micro pattern mold 380 is closely attached to the UV curable resin layer 370 to irradiate UV (FIG. 3B), and the inside of the micro pattern mold 380 may be UV curable resin is cured. When the micro pattern mold 380 is separated from the UV curable resin layer 370, the micro pattern 360 is transferred onto the retroreflective optical sheet 350 as shown in FIG. 3C. Through this process, it is possible to directly transfer the micro pattern on one side or both sides of the retroreflective optical sheet.

The thickness of the micro pattern 360 is preferably 5 to 25㎛ in consideration of the light condensing function and the light diffusing function. Since the micropattern 360 is directly transferred onto the retroreflective optical sheet 350, and a separate substrate layer is not required, the retroreflective optical sheet 350 has a minimum thickness, for example, 5 to 25 μm thick. May be increased to a minimum thickness to prevent light loss.

4A to 4C are views provided to explain a method of manufacturing a retroreflective optical sheet in a method of manufacturing a backlight assembly according to another embodiment of the present invention.

In this embodiment, the micropattern is directly transferred onto the surface of the retroreflective optical sheet 450 to form a micropattern on the retroreflective optical sheet 450. Placing the micro pattern mold 480 corresponding to the shape of the micro pattern on the retroreflective optical sheet 450 (FIG. 4A) and heating and pressing the micro pattern mold 480 on the retroreflective optical sheet 450 as shown in FIG. 4B. The mold 480 is in close contact. Therefore, when the micro pattern mold 480 is separated from the retroreflective optical sheet 450, the micro pattern 460 is transferred to the surface of the retroreflective optical sheet 450.

In this case, the heating temperature for bringing the micro pattern mold 480 into close contact may be 80 ° C. to 150 ° C. in consideration of physical properties of the retroreflective optical sheet 450. The heating temperature is preferably 90 ° C to 120 ° C so as not to affect the physical properties of the retroreflective optical sheet 450.

The present invention will be described in more detail with reference to the following.

[Example]

A backlight assembly having a retroreflective optical sheet according to the present invention and a backlight assembly having a retroreflective optical sheet according to the prior art were manufactured as follows.

Example 1

A backlight assembly employing a direct-type LED on a light guide plate having a size of 100 mm x 100 mm x 30 mm was manufactured, and a retroreflective pattern in which a positive lens-shaped micropattern (50 μm in diameter, 25 μm in height and a refractive index of 1.500) was directly transferred onto the light guide plate. The type optical sheet (thickness 400 mu m) was placed.

Comparative Example 1

On the retroreflective optical sheet, a micro pattern layer having a micro pattern formed on a substrate layer (PET, thickness of 100 μm) was laminated, thereby fabricating a backlight assembly similar to Example 1 except that a micro pattern was formed.

[evaluation]

The backlight assembly according to Example 1 and Comparative Example 1 was evaluated using LightTools, an optical simulation program, and the results are as follows.

Example Brightness (cd / m 2) Example 1 8.86 Comparative Example 1 6.13

As shown in Table 1, in Comparative Example 1, since the loss of light occurred as the base layer having a thickness of 100 μm was separately present between the retroreflective optical sheet and the micropattern, the luminance was much lower. On the other hand, the backlight assembly of Example 1, in which the micropattern was directly transferred onto the retroreflective optical sheet, exhibited a high luminance value by minimizing light loss, and the thickness of the substrate layer (100 μm) was larger than that of Comparative Example 1. It can be seen that a thinner backlight assembly can be realized.

The invention is not to be limited by the foregoing embodiments and the accompanying drawings, but should be construed by the appended claims. In addition, it will be apparent to those skilled in the art that various forms of substitution, modification, and alteration are possible within the scope of the present invention without departing from the technical spirit of the present invention.

100 backlight assembly
110 light source
120 reflector
130 light guide plate
140 diffuser plate
150, 251, 252, 253, 254, 255, 350, 450 Retroreflective Optical Sheet
160, 261, 262, 263, 264, 265, 266, 267, 268, 269, 360, 460 micro patterns
370 UV Curable Resin Layer
380, 480 Micro Pattern Mold

Claims (12)

Light source;
A light guide plate guiding the light from the light source to an emission surface to reflect light to an opposite surface of the emission surface;
A diffusion plate formed on an upper surface of an emission surface of the light guide plate to diffuse light; And
And a retroreflective optical sheet formed on an exit surface side of the diffuser plate and having a micro pattern transferred to at least one surface thereof.
The method according to claim 1,
And the micro pattern is at least one of a positive lens type, a negative lens type, and a prism type.
The method according to claim 1,
And the micro pattern comprises a UV curable resin.
The method according to claim 3,
The refractive index of the UV curable resin is 1.46 to 1.48, characterized in that the backlight assembly.
The method according to claim 3,
The refractive index of the UV curable resin is 1.55 to 1.57, characterized in that the backlight assembly.
The method according to claim 1,
The thickness of the micro pattern is a backlight assembly, characterized in that 5 to 25㎛.
Positioning a diffuser plate having a light source on one surface and diffusing a light diffusion plate on a light guide plate for guiding the light from the light source to an emission surface; And
And placing a retroreflective optical sheet on which at least one surface of the micropattern has been transferred is located on an exit surface side of the diffusion plate.
The method of claim 7,
The retroreflective optical sheet,
Applying a UV curable resin to one surface;
Contacting the micro pattern mold corresponding to the shape of the micro pattern with the UV curable resin;
Irradiating UV; And
Separating the micro pattern mold; and performing a micro pattern transfer to one surface of the backlight assembly.
The method according to claim 8,
The micro pattern mold,
Forming a micro pattern master having the same shape as the micro pattern; And
And forming the micro pattern mold using the micro pattern master.
The method according to claim 9,
The micro pattern mold is formed from the micro pattern master using a pre-plating method or a soft molding method.
The method of claim 7,
The retroreflective optical sheet,
Pressing and heating a micro pattern mold corresponding to the shape of the micro pattern to closely adhere to the retroreflective optical sheet; And
Separating the micro pattern mold; and performing a micro pattern transfer to one surface of the backlight assembly.
The method of claim 11,
The heating temperature is
Method for manufacturing a backlight assembly, characterized in that 90 ℃ to 120 ℃.
KR1020110003898A 2011-01-14 2011-01-14 Backlight assembly and manufacturing method thereof KR20120082560A (en)

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KR1020110003898A KR20120082560A (en) 2011-01-14 2011-01-14 Backlight assembly and manufacturing method thereof

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Application Number Priority Date Filing Date Title
KR1020110003898A KR20120082560A (en) 2011-01-14 2011-01-14 Backlight assembly and manufacturing method thereof

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