KR20120036293A - Back light guide plate and manufacturing method for the same - Google Patents

Abstract

PURPOSE: A backlight light guide plate and a manufacturing method thereof are provided to omit a manufacturing process of a special mold which has a flexible region. CONSTITUTION: An optical sheet(100) comprises a transparent substrate(10) and a micro lens(20). The micro lens has a regular truncated pyramid shape with a repetitive embossed pattern which is formed on one side surface of the transparent substrate. The transparent substrate is made of a transparent material. The width of the regular truncated pyramid shape with the repetitive embossed pattern is decreased along a vertical direction with respect to one side surface of the transparent substrate. The micro lens of the regular truncated pyramid shape is successively arranged parallel to each other.

Description

BACK LIGHT GUIDE PLATE AND MANUFACTURING METHOD FOR THE SAME}

The present invention relates to a backlight light guide plate and a method of manufacturing the same, an optical sheet for homogenizing the distribution of light intensity, a backlight light guide plate that does not need to include an additional light diffusion plate by integrating the optical sheet and the light guide plate, a backlight unit using the same, and It relates to a liquid crystal display device.

Recently, the development of a display device for displaying data processed by an information processing device such as a mobile phone, a computer, or an MP3 player as an image is rapidly being made. Most small and medium sized information processing devices are applied with a flat panel display device having a relatively small volume and weight.

Liquid crystal displays (LCDs), which are representative flat panel displays, display images using liquid crystals interposed between two electrodes. However, the liquid crystal constituting the display element of the liquid crystal display device does not emit light by itself, but merely performs a function of transmitting or blocking light according to an applied electric signal. Therefore, in order to display information on the liquid crystal panel, a surface light emitting device so-called a back light unit (hereinafter, abbreviated as 'BLU') for illuminating the liquid crystal panel from the rear side should be separately provided in the liquid crystal display device. Such BLU should increase the brightness of light and form an even surface light source to uniformly irradiate the liquid crystal panel, which is very important in terms of product quality.

BLU is usually composed of several parts such as a light source lamp, a light guiding plate (light wave guide), a reflection sheet, a diffusion sheet, a prism sheet, and a protective sheet. The light guide plate serves to guide the light evenly from the light source in all directions, and the reflective sheet reflects the light exiting to the lower surface of the light guide plate and returns the light back to the light guide plate. It serves to equalize the brightness by scattering the prism sheet, and the prism sheet improves the brightness by condensing the light up, down, left, and right. The protection sheet protects the grooves between the acid and the acid from the prism sheet to prevent foreign matter such as dust and prevent scratches.

However, the conventional BLU was used in conjunction with the prism sheet together with the diffusion sheet in order to uniformize the brightness and increase the light efficiency. As such, the diffusion sheet is provided separately from the prism sheet, thereby increasing the number of parts, thereby reducing the lightness of the BLU. Not only is it difficult to shorten, there is a problem that the number of assembling process is increased and the defect rate is also increased to increase the overall production cost.

On the other hand, in the development of BLU having high brightness and high light efficiency as described above, an integrated light guide plate in which a prism sheet is integrated with a light guide plate is used. According to Korean Patent Laid-Open Publication No. 2010-0052275, "an integrated light guide plate having a light exit portion having a curved surface, a manufacturing method thereof, and a display device employing the same '' are disclosed.

However, in the manufacture of the integrated light guide plate, the necessity of manufacturing a special mold through a separate process, and the problem of breakage of the integrated light guide plate that comes from the case of injecting the integrated light guide plate from the special mold still remains.

In addition, in order to solve the breakage problem, it is necessary to manufacture a special mold made of a stretchable material, and the problem of reduced life of the mold caused by the increase in production cost and forced mold detachment work resulting from the necessity of using the special mold. The problem of lowering the yield of the integrated light guide plate with the still remains.

The first problem to be solved by the present application is to provide an optical sheet having high light efficiency of high brightness.

The second problem to be solved by the present application is to provide a method for manufacturing an optical sheet having a high light efficiency of the high brightness.

The third problem to be solved by the present application is to provide a backlight light guide plate employing the optical sheet having a high light efficiency of the high brightness.

A fourth object of the present invention is to provide a backlight unit employing the backlight LGP.

The fifth problem to be solved by the present application is to provide a display device employing the backlight unit.

However, the problem to be solved by the present application is not limited to the above-mentioned problem, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the first aspect of the present application, a transparent substrate (substrate); And a micro lens having a horn-shaped repetitive relief pattern formed on one side of the transparent substrate.

In an exemplary embodiment, the horns may be a shape selected from the group consisting of a truncated cone, a polygonal truffle, and a combination thereof, but is not limited thereto.

In an exemplary embodiment, the optical sheet may include a plurality of protrusions on the opposite side of the transparent substrate including the horn-shaped micro lens of the embossed pattern, but is not limited thereto.

The second aspect of the present application may include the optical sheet: and the light guide plate, and may provide a backlight light guide plate in which one side of the light guide plate and the surface of the horn of the optical sheet are bonded by a transparent adhesive.

In an exemplary embodiment, the transparent adhesive may be a UV tape base or an acrylic UV radiation curable adhesive including polyolefin or polyethylene terephthalate (PET), but is not limited thereto.

The third aspect of the present disclosure may provide a backlight unit including the backlight LGP.

The fourth aspect of the present disclosure may provide a display device including the backlight unit.

The fifth aspect of the present application is to form an optical film by forming a horn-shaped micro lens of the repetitive relief pattern on one side of the transparent substrate; And bonding the surface of the horn of the repetitive relief pattern of the optical film to the light guide plate.

In an exemplary embodiment, the horns may be a shape selected from the group consisting of a truncated cone, a polygonal truncated cone and a combination thereof, but is not limited thereto.

In an exemplary embodiment, the method of manufacturing the backlight LGP may further include forming a plurality of protrusions on an opposite side of the transparent substrate including the horn-shaped micro lens of the relief pattern. This is not restrictive.

In an exemplary embodiment, the step of adhering the surface of the horn of the repeated embossed pattern of the optical film to the light guide plate, the step of applying a transparent adhesive to the surface of the horn of the optical film and the optical film coated with the transparent adhesive light guide plate It may be to include a step of bonding to, but is not limited thereto.

In an exemplary embodiment, the method of manufacturing the backlight LGP may include, after adhering the optical film coated with the transparent adhesive to the LGP, a heat curing or UV curing step, but is not limited thereto.

According to the present application, it is not necessary to manufacture a special mold having a flexible part in the process of manufacturing an optical film including a micro lens, and the mold required by applying a slight change to a mold manufacturing apparatus used in a conventional process is needed. It can be manufactured, thereby reducing the cost, special cost for the production of a special mold can be brought.

On the other hand, according to the present application can provide an optical film having a high light efficiency, thereby miniaturizing the backlight unit and thin film of the display device.

1 is a cross-sectional view of an optical sheet according to an embodiment of the present disclosure.
2A is a cross-sectional view of a light guide plate bonded to an optical sheet according to an exemplary embodiment of the present disclosure.
2B is a plan view and a cross-sectional view of a light guide plate according to an embodiment of the present disclosure.
3 is a cross-sectional view of a backlight unit according to an embodiment of the present disclosure.
4 is a diagram illustrating a micro pyramid design structure of a backlight LGP according to an exemplary embodiment of the present disclosure.
FIG. 5 is a graph illustrating an angular luminance profile of the backlight LGP including the micro pyramid structure of FIG. 4.
FIG. 6 is a chart illustrating luminance distributions according to all polar and azimuth angles of a viewing angle of the backlight LGP including the micro pyramid structure of FIG. 4.

DETAILED DESCRIPTION Hereinafter, embodiments and examples of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present disclosure.

It should be understood, however, that the present invention may be embodied in many different forms and is not limited to the embodiments and examples described herein. In the drawings, parts irrelevant to the description are omitted for simplicity of explanation, and like reference numerals designate like parts throughout the specification.

Throughout this specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

The terms "about "," substantially ", etc. used to the extent that they are used throughout the specification are intended to be taken to mean the approximation of the manufacturing and material tolerances inherent in the stated sense, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

A first aspect of the present application, transparent substrate (substrate); And a micro lens having a horn-shaped repetitive relief pattern formed on one side of the transparent substrate.

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

Optical sheet 100 according to an embodiment of the present application has a function of diffusing light in addition to the original function of increasing the brightness by refracting, condensing the light.

As shown in FIG. 1, the optical sheet 100 according to the exemplary embodiment of the present disclosure has a horn-shaped micro lens 20 having a horn-shaped pattern of a repetitive relief pattern formed on one side of the transparent substrate 10 and the transparent substrate 10. It includes.

First, the transparent substrate 10 is a plate-like material made of a transparent material that can transmit light, for example, polycarbonate-based, polysulfone-based, polyacrylate-based, polystyrene ( polystyrene, polyvinylchloride, polyvinyl alcohol, polynorbornene, polyester, and the like. The transparent substrate 10 may be formed of, for example, polyethylene terephthalate or polyethylenenaphthalate, but is not limited thereto.

The thickness of the transparent substrate 10 may be a general transparent substrate used for the optical film of the backlight unit, for example, may be about 10 ㎛ to about 1000 ㎛, or may be about 25 ㎛ to about 600 ㎛ have. The transparent substrate 10 has excellent mechanical strength and thermal stability in the thickness range as described above, can be provided with appropriate flexibility, and there is little loss of transmitted light. That is, less than about 10 μm has a weak mechanical strength, and more than about 1000 μm may be problematic in view of the realization of the thin film of the display.

In the transparent substrate 10, a horn-shaped micro lens 20 having a plurality of three-dimensional relief patterns that not only refracts and collects light but also has a light diffusing function is, for example, one of the transparent substrates 10. It is arranged parallel to the side.

As shown in FIG. 1, the horn 20 of the embossed pattern has a shape that becomes narrower in a direction perpendicular to one side of the transparent substrate. The horn-shaped micro lens 20 may be continuously arranged in parallel with each other.

Where A is the distance between the horn-shaped micro lens and the adjacent horn-shaped micro lens, wherein the distance indicates the distance from the center of the embossed pattern horn to the center of, where A may be about 5 μm to about 500 μm. For example, about 50 μm to about 300 μm, or about 100 μm to about 200 μm, but is not limited thereto. If the value of A is less than about 5 μm, there is a difficulty in total reflection, and when the value of A exceeds about 500 μm, there may be a difficulty in light concentration. W is the width of the horn-shaped micro lens 20 of the embossed pattern, and the value may be about 5 μm to about 500 μm, for example, about 50 μm to about 300 μm, or about 100 μm To about 200 μm, but is not limited thereto. H is the height of the relief pattern, and the value may be about 5 μm to about 500 μm, for example, about 50 μm to about 300 μm, or about 100 μm to about 200 μm, but is not limited thereto. It doesn't happen.

The horn-shaped micro lens of the optical sheet may be provided with a form in which the interval gradually narrows from the edge of the optical sheet to the central portion as well as within the numerical range in setting the interval. The shape may have a form in which the distribution of the horn-shaped micro lens of the optical sheet increases toward the center, but is not limited thereto.

In one embodiment of the present application, the optical sheet may further include a plurality of protrusions on the opposite side of the transparent substrate including the horn-shaped micro lens of the embossed pattern, but is not limited thereto.

The protrusions are formed on the opposite transparent substrate on which the microlenses of the optical sheet are formed, and serve to assist the light diffusion function, and may be formed regularly or randomly, but are not limited thereto. The protrusion may include a component of the substrate of the optical film, and the size may be about 5 μm to about 100 μm, for example, about 20 μm to about 80 μm, or about 30 to about 60 μm It may be, but is not limited thereto.

The second aspect of the present application, the optical sheet; And a light guide plate, wherein one side of the light guide plate and a surface of a horn of the optical sheet are bonded by a transparent adhesive.

As an embodiment of the present application, it will be described with reference to FIGS. 1 and 2A.

The optical film 100 may be attached to the light guide plate 30 by a transparent adhesive. At this time, the light guide plate and the light guide plate 25 of the horn-shaped micro lens 20 of the repetitive embossed pattern is coupled to one side of the transparent substrate 10 by a transparent graft.

In this case, the light guide plate may be an integral light guide plate used in the backlight unit, and may be a flat plate or a light guide plate having one surface and a slope at a predetermined angle with the other surface, but is not limited thereto.

Transparent adhesive according to an embodiment of the present application may be an optically transparent adhesive, but is not limited thereto. For example, the transparent adhesive may be a UV tape base or an acrylic UV radiation curable adhesive including polyolefin or polyethylene terephthalate (PET).

FIG. 2B is a plan view and a cross-sectional view of the light guide plate according to the exemplary embodiment of the present disclosure. As described with reference to FIG. 2B, light coming from the side surface is propagated without light loss through total internal reflection. Some of the rays enter the interface of the embossed pattern, and these lights are emitted out of the light guide plate vertically. Therefore, the intensity of light at a predetermined portion of the light guide plate is determined according to the horn-shaped micro lens 20 having an embossed pattern and its density. By designing the size and density of the horns 20 of the embossed pattern, it is possible to manufacture a light guide plate with uniform brightness and high light efficiency. Since the light once incident on the embossed pattern is all the light exiting the light guide plate, the light traveling inside the light guide plate minimizes disordered diffuse reflection, thereby minimizing the loss of light.

In a third aspect of the present application, a backlight unit including the backlight light guide plate is provided.

In one embodiment of the present application, the backlight unit may further include a light source device, a diffusion film, a reflective film, and the like, including the backlight LGP. However, it will be apparent to those skilled in the art that the diffusion film may be omitted in view of excellent light efficiency of the backlight LGP of the present application.

A backlight unit according to an embodiment of the present disclosure will be described with reference to FIG. 3. 3 is a schematic cross-sectional view of a backlight unit according to an embodiment of the present disclosure.

As shown in FIG. 3, the backlight unit 200 according to the exemplary embodiment of the present disclosure includes an optical sheet 100 and a light guide plate 30 on which a horn-shaped micro lens 20 of the optical sheet 100 is formed. And a backlight light guide plate, a light source 40, and a reflecting plate 50.

The light guide plate 30 guides the light supplied to the light source 40 toward the liquid crystal display panel. The light guide plate 30 is made of a plastic-based material such as acryl, and various patterns are formed on the lower surface of the light guide plate 30 to change the traveling direction of light incident into the light guide plate 30 toward the liquid crystal display panel. do. Here, the case where the light guide plate 30 has a flat shape will be described. However, the light guide plate 30 may have a wedge shape in which its thickness gradually decreases toward one end.

The light source 40 may be located at one side or both sides of the light guide plate 30, and the light source 40 may be a point light source such as a light emitting diode (LED) or a cold cathode fluorescent lamp (CCFL). A line light source such as) may be used. In addition, a plurality of point light sources may be used, or a means for converting the point light source into linear light may be used together with the point light source. In addition, although not shown, when the light guide plate 30 has a wedge shape, the light source 40 may be located only on one side of the light guide plate. The reflector 50 is disposed on the rear surface of the light guide plate 30 to reflect light emitted to the rear surface of the light guide plate 30 toward the upper surface of the light guide plate 30. The reflective plate 50 reduces the loss of light incident on the display panel of the display device and improves the uniformity of the light transmitted to the upper surface of the light guide plate 30. The optical sheet 100 positioned on the upper part of the light guide plate 30 has a protruding shape that becomes narrower toward the upper portion of the transparent substrate 10, and the government part 25 is, for example, ground. The horns 20 of a plurality of embossed patterns with predetermined surface roughness are arranged. The optical sheet 100 is generally composed of two sheets so that the horn-shaped microlenses 20 of each embossed pattern are arranged to cross each other at a predetermined angle, and the light emitted through the light guide plate 30 is liquid crystal. The light may be refracted in a direction perpendicular to the display panel, to collect light, and to diffuse light. That is, in addition to the function of the original optical sheet 100, light is diffused by a surface having a predetermined surface roughness on the top portion 25 of the horn-shaped micro lens 20 having an embossed pattern, thereby improving the brightness uniformity of the light. Widening the viewing angle, and serves to hide the pattern of the light guide plate 30. Since this optical sheet 100 is as above-mentioned, detailed description is abbreviate | omitted here. Although not shown, in some cases, a protective sheet may be further disposed on the optical sheet 100.

In a fourth aspect of the present application, a display device including the backlight unit is provided. The display device may include an LCD display device, an LED display device, or an electronic paper, but is not limited thereto.

It will be apparent to those skilled in the art that the display device may be manufactured by a method adopted in a general display process including the backlight unit.

In the fifth aspect of the present invention, to form an optical lens by forming a micro lens of the horn of the repetitive relief pattern on one side of the transparent substrate; And bonding the surface of the horn of the repetitive relief pattern of the optical film to the light guide plate.

Referring to FIGS. 1 and 2A as a method of manufacturing a backlight LGP according to an exemplary embodiment of the present disclosure, an optical lens is formed by forming a horn-shaped micro lens 20 having a repetitive relief pattern on one side of the transparent substrate 10. The sheet 100 is manufactured. The horns 20 of the repetitive relief pattern may be formed by forming one side of the transparent substrate 10 by using an imprint process, or by attaching the horns manufactured by precision lathe to one side of the transparent substrate 10.

In one embodiment, the manufacturing of the optical sheet 100 in which the horn 20 of the embossed pattern is formed on one side of the transparent substrate 10 by using nanoimprint lithography, the desired pattern is precise After preparing a mold for imprint of a hard material such as silicon (Si) formed by lathe processing, the transparent substrate 10 is opposed to each other, and then placed between press plates to be processed at high temperature and high pressure to separate the mold from the substrate. The pattern of the mold is transferred to the transparent substrate 10 in a manner. The advantage of this nanoimprint lithography method is that the use of a rigid mold such as Si makes it easy to implement ultrafine patterns.

In the formation of the government part 25, for example, it is possible to have a protruding shape in which grinding is performed to form bumpy irregularities. That is, the horns 20 of the embossed pattern may have a prism structure of a square pyramid shape, including a flat government portion 25 in which the unevenness is formed, but is not limited thereto. Polypyramids may also be possible. Also, for example, it may be made of any one of hemispheres and lenticular, or two or more of these shapes.

The government part 25 of the horn 20 of an embossed pattern can have predetermined surface roughness by the processus | protrusion formed by grinding process etc., for example. Horn pattern 20 of the embossed pattern is provided with a top portion 25 having a surface roughness in the range as described above, the light entering through the back of the transparent substrate 10 is emitted to the outside through the horns 20 of the embossed pattern. In the process, it is evenly spread by the minute projections formed on the top portion 25 of the horn 20 of the embossed pattern can improve the light diffusion efficiency.

In addition, the government part 25 of the horns 20 of the embossed pattern forms a plane to prevent damage and deformation of the liquid crystal display panel (not shown) and the optical sheet 100 of the liquid crystal display device. Since the protective sheet which was interposed between 100 can be omitted, not only the number of single parts can be reduced but also the production cost can be reduced.

The light guide plate 30 is a component that converts the light supplied to the light source into uniform planar light. The light guide plate 30 serves to guide the light source toward the liquid crystal display panel as the most essential component in the BLU. The light guide plate 30 may include, for example, a polymethacrylate (PMMA) -based material, and an olefin-based transparent resin having a specific gravity of 1.0 may be used for weight reduction. PMMA-based materials are not easily broken or deformed due to high mechanical strength, light weight, strong chemical resistance, and low absorption of light in the visible light range, and thus have good transparency and gloss.

As a method of manufacturing the light guide plate 30, as in the case of manufacturing the optical sheet 100, a nanoimprint lithography method may be used, which is a polydimethylsiloxane (PDMS) to prepare a mold, Polymethyl methacrylate (PMMA) may be formed on both sides of the substrate forming the carbonate (PC).

The optical sheet 100 may include a plurality of protrusions (not shown) on the other side of the transparent substrate 10. This causes the light generated from the light source to pass through the plurality of protrusions and evenly distribute the light to the front. Therefore, the light passing through the projections is uniformly distributed over the entire area of the optical sheet 100. Therefore, the plurality of projections have the effect of raising the front brightness of the light.

In one embodiment of the present application, the method may further include forming a plurality of protrusions on the other side of the transparent substrate.

In one embodiment of the present application, the step of adhering the surface of the horn of the repeating embossed pattern of the optical film to the light guide plate, the step of applying a transparent adhesive to the surface of the horn of the optical film and the optical film coated with a transparent adhesive It is possible to provide a method for producing a backlight light guide plate that is adhered to.

That is, as shown in FIG. 1B, the surface of the horn 20 of the repetitive relief pattern formed on the optical sheet 100 is adhered to the light guide plate 30. The optical sheet 100 and the light guide plate 30 may be attached by thermosetting or UV curing.

In one embodiment of the present application, after attaching the optical film coated with the transparent adhesive to the light guide plate, and further comprising a thermosetting or UV curing step, can provide a method of manufacturing a backlight light guide plate, the optical sheet 100 And when the light guide plate 30 is attached by UV curing, first, the light guide plate 30 and the optical sheet 100 with the embossed pattern is prepared. UV resin is coated on the prepared light guide plate by using a screen printing technique using a printing mask. For example, the UV resin may be selected from the group consisting of polyethylene, polypropylene, polycarbonate, polyester, polyacryl, and combinations thereof. In addition, the UV resin may use a UV resin having a low viscosity, for example, in the range of about 1 to about 4000 cP (25 ° C.). In this case, using a general coating method, such as laminating, spin coating, roll coating, sputtering method, the UV resin is not uniformly applied to the entire surface of the light guide plate, and the problem of overflow occurs. Problems that make coating impossible may occur, but the screen printing technique using a printing mask may solve this problem.

A primer coating process may be imposed between the preparation step of the light guide plate 30 and the application step of the UV resin, but this step may be omitted as necessary. The reason for applying the primer is to increase adhesion and adhesion between the light guide plate 30 and the optical sheet 100. Such primers may be used with acrylic primers, which may be printed and applied with a gravure printing press and dried by an IR dryer.

Subsequently, the optical sheet 100 having the relief pattern formed on the light guide plate 30 coated with the UV resin is set to be in contact with only one side, and then the optical sheet 100 is in contact with the side from which the optical sheet 100 is in contact. Roll-pressing is performed such that pressing is performed while the optical sheet is in contact with the light guide plate 30 sequentially in the other side direction, which is not provided. When the roll pressing is finished and the optical sheet 100 is in contact with the UV resin applied to the light guide plate 30, the UV resin is irradiated using UV lamp to cure the UV resin to cure the light guide plate 30 and the optical sheet 100. Can be bonded. The light guide plate 30 thus manufactured is completed through sizing and side cleaning operations.

The liquid crystal display according to the exemplary embodiment of the present disclosure includes the backlight unit 200 of the present application, and may include other liquid crystal display panels, upper and lower storage containers, intermediate mold frames, lower mold frames, and front and rear covers. The construct can be made by a person of ordinary skill in the art among those known in the art.

Hereinafter, with reference to the embodiment and the drawings will be described in detail. However, the present application is not limited to these examples and drawings.

[ Example ]

4 is a diagram illustrating a micro pyramid structure of a backlight LGP according to an exemplary embodiment of the present disclosure. The micro-embossed pattern of the backlight LGP has a square pyramid shape, and simulations were performed under conditions having a bottom side of 100 μm, a height of 60 μm, a side slope of about 51 °, and a side corner angle of about 58 °.

FIG. 5 is a graph illustrating an angular luminance profile of the backlight LGP including the micro pyramid structure of FIG. 4. FIG. 5 shows a change in luminance according to viewing angles in two directions, and shows a distribution of luminances depending on the viewing angles of the upper and lower viewing angles and the viewing angles of the left and right viewing angles. It can be seen that the luminance is improved in the moderately narrow viewing angle range in the vertical direction (red line), and the luminance is improved in the wide viewing angle in the left and right directions (blue line).

FIG. 6 is a chart illustrating luminance distributions according to all polar and azimuth angles of a viewing angle of the backlight LGP including the micro pyramid structure of FIG. 4. 5 is shown in two directions of up, down, left, and right, and FIG. 6 is shown in all directions. Referring to FIG. 6, it was confirmed that the backlight light guide plate of the present application had a sufficient luminance emission distribution without adding a separate sheet.

As a result of the simulation as described above, the luminance according to the viewing angle around the light guide plate vertical direction was able to obtain the ideal uniformity. By designing a distribution in which the micro pyramid structure has the same size and the density per unit area is appropriately adjusted, a light guide plate having uniform brightness can be manufactured at all positions.

As described above, the light guide plate manufactured according to the exemplary embodiment of the present application, the backlight unit and the liquid crystal display using the same, the light guide plate itself has a scattering function and a prism function, thereby improving the luminance of the backlight emitting surface to lower the illuminance of the light source lamp. Therefore, it is possible to reduce the power consumption of the LCD module, to eliminate the need for additional diffusion sheets, and to use one sheet of optical sheets, which is required for a large number of devices.

Although embodiments and embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present application pertains may realize the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

10: transparent base material 20: Horn of embossed pattern
25: Government 30: Light Guide Plate
40: light source 50: reflector
100: optical sheet 200: backlight unit

Claims (12)

Transparent substrates; And
A horn-shaped micro lens of a repetitive relief pattern formed on one side of the transparent substrate:
Including, the optical sheet.
The method of claim 1,
The horn is an optical sheet that is selected from the group consisting of truncated cone, polygonal truncated cone and combinations thereof.
The method of claim 1,
The optical sheet further comprises a plurality of protrusions on the opposite side of the transparent substrate including the horn-shaped micro lens of the embossed pattern.
An optical sheet according to claim 1, comprising a light guide plate,
One side of the light guide plate and the surface of the horn of the optical sheet is bonded by a transparent adhesive, back light guide plate.
The method of claim 4, wherein
The transparent adhesive is a UV tape base or an acrylic UV radiation curable adhesive comprising a polyolefin or polyethylene terephthalate (PET), the backlight LGP.
A backlight unit comprising the backlight light guide plate according to claim 4.
Display device comprising a backlight unit according to claim 6.
Manufacturing an optical film by forming a horn-shaped micro lens having a repetitive relief pattern on one side of the transparent substrate; And
Adhering the surface of the horn of the repetitive relief pattern of the optical film to the light guide plate:
A manufacturing method of a backlight light guide plate comprising a.
The method of claim 8,
The horn is a shape selected from the group consisting of a truncated cone, a polygonal truncated cone and a combination thereof, a method of manufacturing a backlight light guide plate.
The method of claim 8,
And forming a plurality of protrusions on the opposite side of the transparent substrate on which the horn-shaped micro lens of the repetitive relief pattern is formed.
The method of claim 8,
Affixing the surface of the horn of the repeating embossed pattern of the optical film to the light guide plate includes applying a transparent adhesive to the surface of the horn of the optical film and bonding the optical film coated with the transparent adhesive to the light guide plate. It is a manufacturing method of a backlight light guide plate.
The method of claim 11,
After bonding the optical film coated with the transparent adhesive to the light guide plate, further comprising the step of thermosetting or UV curing, the method of manufacturing a backlight light guide plate.

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