WO2012124983A2 - Microlens array sheet and backlight unit having same - Google Patents

Microlens array sheet and backlight unit having same Download PDF

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Publication number
WO2012124983A2
WO2012124983A2 PCT/KR2012/001848 KR2012001848W WO2012124983A2 WO 2012124983 A2 WO2012124983 A2 WO 2012124983A2 KR 2012001848 W KR2012001848 W KR 2012001848W WO 2012124983 A2 WO2012124983 A2 WO 2012124983A2
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WO
WIPO (PCT)
Prior art keywords
lens
array sheet
array
microlens
micro
Prior art date
Application number
PCT/KR2012/001848
Other languages
French (fr)
Korean (ko)
Other versions
WO2012124983A3 (en
Inventor
김윤현
한상철
Original Assignee
주식회사 엘지화학
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020120025766A external-priority patent/KR101265312B1/en
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to JP2013558788A priority Critical patent/JP2014510952A/en
Priority to CN201280011801.7A priority patent/CN103430056B/en
Priority to US14/000,839 priority patent/US8896925B2/en
Publication of WO2012124983A2 publication Critical patent/WO2012124983A2/en
Publication of WO2012124983A3 publication Critical patent/WO2012124983A3/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00278—Lenticular sheets
    • B29D11/00298—Producing lens arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0043—Inhomogeneous or irregular arrays, e.g. varying shape, size, height
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • Micro lens array sheet and back light unit including the same
  • the present invention relates to a microlens array sheet which can be used in a backlight unit and a backlight unit including the same, and more particularly , a microlens having an arrangement of microlenses with improved moire and improved optical performance.
  • a liquid crystal display device is an electronic device that transmits various electrical information generated by various devices to visual information by using a change in liquid crystal transmittance depending on an applied voltage.
  • Liquid crystal displays have been attracting attention as an alternative means to overcome the shortcomings of CRTCCathode Ray Tubes, which have been widely used since they have advantages such as miniaturization, light weight, and low power consumption. It is a situation that is installed in all information processing equipment.
  • such a liquid crystal display device generally applies a voltage to a liquid crystal having a specific molecular arrangement to change it into another molecular arrangement, and the birefringence, light beneficiation, dichroism, and light scattering characteristics of the liquid crystal generated by the change of the molecular arrangement
  • Optical It is a display device that converts a change into a visual change and uses modulation of light by liquid crystal.
  • a liquid crystal display device which is a light-receiving element without a self-luminous source, requires a separate light source device capable of illuminating the entire screen of the device.
  • Such an illumination device for a liquid crystal display device is commonly referred to as a backlight unit.
  • the backlight unit is distinguished from the edge method and the direct method according to the manner in which the light emitting lamp is arranged.
  • the edge method is a method in which a light emitting lamp is disposed on an axis of a light guide plate for guiding light generated from a light emitting lamp.
  • the edge method is applied to a relatively small liquid crystal display such as a monitor for a desktop computer or a notebook and has good light uniformity and durability. This is excellent and is advantageous for thinning the device.
  • the direct method was developed to be used in a medium-to-large display device of 20 inches or more, and a method of directly illuminating the front of the liquid crystal panel by arranging a plurality of lamp light sources under the liquid crystal panel.
  • a linear light source such as a cold cathode fluorescent lamp (CCF ⁇ ) has been widely used in the light emitting lamp for a backlight unit.
  • CCF ⁇ cold cathode fluorescent lamp
  • color reproducibility is superior to CCFL, it is less environmentally friendly, thinner,
  • LEDs light emitting diodes
  • a conventional backlight unit includes a plurality of backlight units for the purpose of diffusing or condensing light generated from a light source, improving luminance, or reducing lamp mura.
  • Optical film is used together.
  • FIG. 1 illustrates a conventional direct backlight unit by way of example, and a plurality of light sources 2 are arranged on a reflector plate 1, and the upper part of the light source is used to uniform the brightness of the entire screen and serve as a support for the optical films.
  • the diffuser plate 3 is used.
  • One or more diffuser films 4 and 5 may be used to focus the light diffused by the diffuser plate 3 into the effective viewing range and to increase the uniformity of the screen brightness.
  • Condensing films used in such a back light unit include a prism film, a lenticular film or a micro lens array (MLA) sheet.
  • the microlens array sheet performs both a condensing function and a diffusing function, but as shown in FIG.
  • Moire phenomenon occurs due to geometric interference.
  • Moire refers to an interference pattern generated when two or more periodic patterns overlap, and when two optical films having similar light and dark patterns overlap, a new light and dark pattern is generated. This is the moiré phenomenon.
  • Moire avoids this because it forms an unnecessary pattern in the image implemented in LCD.
  • the luminance may be drastically reduced.
  • the brightness and the viewing angle are very important characteristics, which are known to be determined by the characteristics of the optical sheet constituting the backlight unit.
  • the hemispherical microlens array sheet has been widely used, but such a hemispherical microlens array sheet has a limitation in increasing the luminance, and when the viewing angle characteristic is improved, the luminance is relatively low. Therefore, there is a need for a micro lens array sheet having an array of micro lenses capable of improving moiré while minimizing a decrease in luminance.
  • one aspect of the present invention is to provide a micro lens array sheet with improved moiré while maintaining excellent brightness. Accordingly, another aspect of the present invention is to provide a micro lens array sheet having improved luminance and viewing angle made of a conic lens. Thus another aspect of the present invention includes the micro lens array sheet Moire is improved, and to provide a backlight unit with improved brightness and viewing angle.
  • a base portion and a plurality of micro lenses formed on one surface of the base portion, wherein the plurality of micro lenses have an irregular arrangement the distance between the center points of two adjacent micro lenses Standard deviation of the microlens array sheet is provided, in which one microlens is selected to have an average pitch p between adjacent microlenses at a center point of the selected microlens.
  • a backlight unit including the micro lens array sheet is provided.
  • the backlight unit may include two sheets of the micro lens array sheet.
  • the present invention by removing the microlens periodicity of the microlens array sheet, it is possible to prevent the moiré phenomenon and to minimize the decrease in luminance. In addition, it is possible to improve the characteristics of the brightness and viewing angle at the same time by using a micro lens array sheet made of a conic lens. Therefore, when used in a liquid crystal panel, it is possible to provide a high quality screen in which the contrast pattern caused by moiré is reduced.
  • FIG. 1 schematically illustrates a configuration of an exemplary known backlight unit.
  • FIG. 2 schematically shows the microlens placement of an exemplary known microlens array sheet in which the microlens has a Honeycomb arrangement, showing schematically the underside of the lens.
  • FIG. 3 schematically shows the microlens arrangement of an exemplary microlens array sheet of the present invention having a random arrangement within a constant displacement, showing schematically the underside of the lens
  • FIG. 4 shows the microlens array having the lens arrangement as described above.
  • FIG. 5 schematically shows a configuration of a backlight unit according to an embodiment of the present invention.
  • FIG. 6 illustrates a moiré phenomenon using LightTools of Optical Research Associates after stacking two light collecting films of Example 1 by rotating about 5 degrees.
  • FIG. 7 shows a moiré phenomenon measured using optical tools of Optical Research Associates after stacking two light collecting films of Example 2 by rotating about 5 degrees.
  • FIG. 8 shows the moiré phenomenon using LightTools of Optical Research Associates after stacking two light collecting films of Comparative Example 1 of the present invention by rotating about 5 degrees.
  • the present invention includes a base portion, and a plurality of micro lenses formed on one surface of the base portion, wherein the plurality of micro lenses have an irregular arrangement, and distances and standard deviations between two adjacent ones and the thickening points of the micro lenses.
  • the present invention relates to a microlens array sheet, in which one microlens is selected to have an average pitch P between adjacent microlenses at a center point of the selected microlens.
  • the present invention relates to a standard deviation of distances between centers of two adjacent micros in the arrangement of microlenses; a) selecting one microlens and an average pitch between adjacent microlenses at the center of the selected microlens.
  • the micro lenses satisfy the above range. It is more preferable to have an irregular arrangement at the same time. If the arrangement of the microlenses has a regular arrangement while satisfying the standard deviation of the present invention, the moiré phenomenon may occur due to the periodicity of the microlens arrangement.
  • the average value (average pitch, P) of the distances between the adjacent lens center points is 10 / ffl -500 / iffl. If the average value is smaller than lOjum, it is difficult to manufacture the lens mold. If the average value is larger than 500im, the height of the lens increases, which increases the manufacturing cost due to the increase of the volume of the lens, the appearance of the lens is easily recognized, and the uniformity of the light distribution decreases. This can lower the appearance quality.
  • the microlenses of the present invention may be arranged using the triangles formed by connecting center points of three adjacent microlenses as basic array units A1 to A6.
  • LI, L2 and L3 represent the length of each side of the triangle which is the basic arrangement unit
  • ⁇ 1, ⁇ 2 and ⁇ 3 represent the angle of each inner angle of the triangle which is the basic arrangement unit.
  • the triangles formed by connecting the center points of the micro lenses are preferably formed to have different areas.
  • the area variation rate of the triangles that are the basic arrangement unit is 2 ⁇ 203 ⁇ 4 It is preferable and it is most preferable that it is 2 to 9%.
  • the ratio of the basic array units which are all basic array unit presentation triangles is less than 50%.
  • 2 shows a lens arrangement of a conventional micro lens array sheet. As shown in FIG. 2, it is common to form a conventional micro lens array sheet in a regular array such as a honeycomb array in which triangles formed by connecting center points of respective lenses form an equilateral triangle.
  • the microlens array sheet of the present invention can prevent the brightness from being lowered while reducing the moiré by modifying the basic array unit while basically maintaining the triangular array as described above.
  • the ratio of the arrangement unit which is an equilateral triangle among the said basic arrangement units is less than 50% of the whole.
  • the present invention more preferably does not include an array unit forming an equilateral triangle, and the array unit is represented by the following formula (1) or It is preferable to satisfy Formula (2), Most preferably, following Formula (1) and Formula (2) are satisfied simultaneously.
  • Equation (2) In this equation, LI, L2 and L3 are the lengths of the sides of the array unit, and ⁇ is the average pitch of the microlenses. In addition, in Equation (2), ⁇ 1, ⁇ 2 and ⁇ 3 are angles of the respective internal angles of the array unit.
  • the length of each side of the microlens array unit of the present invention is less than 80% or more than 120% of the average pitch ( ⁇ )
  • the angle of each cabinet angle of the array unit is 48 ° If it is less than or exceeds 72 ° , there is also a problem that the brightness is significantly lowered.
  • the shape of the micro lens that can be employed in the present invention is preferably selected from the group consisting of hemispheres, cones, conic and ellipses, but is not limited thereto, polypyramids, polygonal pyramids, other aspherical lenses, etc. It can be used in the lens arrangement of the invention.
  • the average diameter (D) of the microlenses is 90% to 126% of the average pitch, and when the diameter is less than 90% of the average pitch, the problem of low luminance increase even in a film having a general microlens arrangement is problematic. In addition, if it exceeds 126% of the pitch, it is meaningless to define a lens that protrudes by exceeding the diameter of the lens where the porosity may be zero within the random arrangement range proposed by the present invention. Further, the microlenses disposed on the substrate portion may have different diameters (D) of the bottom surface, but preferably microlenses having the same diameter are used.
  • the height of the microlenses is preferably 20% to 100 3/4> of the average pitch, and when the height is less than 20% of the average pitch, the luminance increase effect tends to be low even in a general microlens arrangement. 100% If it exceeds, it is not only easy to fabricate, but even the general microlens arrangement tends not to be excellent in brightness enhancement.
  • the height of the lenses may be different, it is easier to adjust the lens arrangement to improve the moiré while minimizing the brightness reduction when performing the limited random placement of the present invention using the same height microlenses.
  • the microlens of the present invention may be a conic-type lens, and the 'conic lens' includes all curved surfaces including a case in which the bottom surface of the lens is circular and the vertical cross section of the center of the lens is hyperbolic and parabolic. It means a conical lens having a triangular vertical cross section at the center of the lens, a hemispherical lens having a semicircular cross section, and an elliptical lens having an elliptical cross section.
  • the shape of the conic lens can be specified from the following equation (3), in which H is the height from the bottom of the conic lens to the imaginary vertex, r represents the radius of the curve and at the peak of the lens, k Denotes a conic constant.
  • H is the height from the bottom of the conic lens to the imaginary vertex
  • r represents the radius of the curve and at the peak of the lens
  • k Denotes a conic constant.
  • the shape of a curved lens is expressed as a function of the curve at the vertex of the lens as the radius (r) and the conic constant (k) as variables.
  • the koenic constant k determines the shape of the lens.
  • the conic constant (k) of the conic lens is -3 to -1, more preferably -2.8 to -1.5.
  • curd at the said Konak lens vertex is 0.2%-26% of the said average pitch P, More preferably, it is 20%. If it is less than 0.2%, it may be defective or vulnerable to scratch at the time of mass production of the product, there may be problems such as bubble generation and production time delay, and if it exceeds 26%, there is a problem in light collection efficiency.
  • An arrangement of exemplary microlenses of the present invention is shown in FIGS. 3 and 4, FIG.
  • FIG. 3 is an illustration of an arrangement of microlenses caused by a bottom surface
  • FIG. 4 of the present invention in which microlenses are arranged in accordance with the present invention.
  • a perspective view of an exemplary micro lens array sheet is shown.
  • Methods for producing a microlens array sheet using a mold are well known in the art, and those skilled in the art will be able to manufacture the microlens array sheet of the present invention with reference to the description herein and the prior art.
  • the microlens array sheet of the present invention is formed between a mold and a plate-shaped mold and a base portion of which the lens shape of the present invention is engraved on the light exit surface after forming a base portion by extruding a thermoplastic resin or the like into a film form.
  • the microlens array sheet of the present invention can be produced by injecting a curable resin into a desired pattern on the light exit surface of the film and irradiating ultraviolet rays or heat to the film on which the pattern is formed.
  • the conic lens of the present invention can be formed by placing a cured resin solution in a mold having a conic lens shape engraved on the substrate and then curing the ah, a method of arranging asymmetric beads, a mask using a laser It may be formed by an etching method and a direct processing method, a manufacturing method using photolithography, and the like.
  • the curable resin usable in the present invention may include a urethane acrylate, epoxy acrylate, ester acrylate or a radical-generating monomer, and these may be used alone or in combination, but is not limited thereto. .
  • Using a mold in which various shapes are engraved lenses having various shapes, heights, and pitches can be formed.
  • the lens shape of the light exit surface in the mold is known in the art, such as conventional mold manufacturing methods, such as mechanical cutting, photoresist reflow method, photoresist laser exposure method, bead coating, laser etching, etc. Through way etc. You can get it.
  • the mold may be a flat plate, a caterpillar or a drum-type mold, and may be made of a hard material such as metal or ceramic such as nickel or chromium or a soft material such as polymer or silica coated polymer film.
  • the present invention relates to a backlight unit including the micro lens array sheet.
  • the backlight unit includes a light source and at least one micro lens array sheet on the light source.
  • the microlens array sheet that can be used in the backlight unit of the present invention is as described above, and the microlens array sheet of the present invention is disposed between the light source unit and the liquid crystal panel and used for the liquid crystal display display.
  • the microlens array sheet is preferably laminated between the light guide plate and the liquid crystal panel when applied to the edge type backlight, and is disposed between the light source and the liquid crystal panel when applied to the direct type backlight, preferably on the diffuser plate. do.
  • a reflector having excellent reflectance under the light source.
  • the position referred to as the lower portion of the light source is understood to refer to the lower portion of the light guide plate more clearly in the case of the edge type backlight.
  • the backlight unit of the present invention in addition to the above-described micro lens array sheet Additional optical films may be included, and the additional optical film may be any optical film known in the art, such as a diffusion film or a condensing film, and may be appropriately added and configured as necessary.
  • the backlight unit of the present invention may preferably include two micro lens array sheets of the present invention.
  • a light condensing film in which microlenses were two-dimensionally arranged was formed such that the standard deviation of the distances between the two was 2.3 and the area variation rate of the triangles, which were the basic arrangement units, was 4.5%.
  • Example 1 Except that the microlenses were two-dimensionally arranged in Example 1 so that the standard deviation of the distances between the center points of two adjacent lenses was 9.2 / and the area variation rate of the triangles which were the basic arrangement units satisfies 18.5%. The conditions similarly formed the condensing film. Comparative Example 1
  • Example 2 a condensing film was formed by regularly arranging conic lenses in two dimensions. Comparative Example 2
  • Example 1 and 2 The other conditions are the same except that the microlenses are two-dimensionally arranged so that the standard deviation of the distances between the center points of two adjacent lenses in Example 1 is 0.6 and the area variation rate of the triangles, which is the basic arrangement unit, is satisfied.
  • Condensing film was formed.
  • each of the light collecting films were rotated about 5 degrees from each other in lamination on the backlight, and the center luminance value and the moire characteristics of the light were measured by a ray-tracing program (Ray).
  • the simulation was performed using a tracing program, LightTools of Optical Research Associates.
  • the luminance measurement results were shown in the following [Table 1], and the moire characteristics of Example 1 and Example 2 were the same as those of [Fig.
  • the luminance of the lens array method is higher than that of the lens array method having a regular array. It can be seen that there is an effect that the moiré phenomenon is remarkably improved while reducing the decrease.

Abstract

The present invention relates to a microlens array sheet with enhanced optical performance, and a backlight unit having same, and more specifically, to a microlens array sheet and a backlight unit having same, the microlens array sheet comprising: a base portion; and a plurality of microlenses formed on one surface of the base portion, wherein the plurality of microlenses have an irregular array, and the standard deviation of the distance between the mid points of two microlenses adjacent to each other is, 2-20% of the average pitch(p) between microlenses adjacent from the mid point of a selected microlens after selecting one of the microlenses.

Description

【명세서】  【Specification】
【발명의 명칭】  [Name of invention]
마이크로 렌즈 어레이 시트 및 이를 포함하는 백락이트 유닛 Micro lens array sheet and back light unit including the same
【기술분야】  Technical Field
본 발명은 백라이트 유닛에 사용될 수,있는 마이크로 렌즈 어레이 시트 및 이를 포함하는 백라이트 유닛에 관한 것으로서, 보다 구체적으로는 모아레 (moire)가 개선된, 마이크로 렌즈의 배치를 갖으며， 광학성능이 향상된 마이크로 렌즈 어레이 시트 및 이러한 마이크로 렌즈 어레미 시트를 구비한 백라이트 유닛에 관한 것이다. The present invention relates to a microlens array sheet which can be used in a backlight unit and a backlight unit including the same, and more particularly , a microlens having an arrangement of microlenses with improved moire and improved optical performance. An array sheet and a backlight unit having such a micro lens array sheet.
【배경기술】  Background Art
일반적으로 액정표시장치 (Liquid Crystal Display Device)는， 인가 전압에 따론 액정 투과도의 변화를 이용하여 각종 장치에서 발생되는 여러 가지 전기적인 정보를 시각 정보로 변화시켜 전달하는 전자 소자이다. 액정표시장치는 소형화， 경량화, 저전력 소비화 등의 장점을 가지고 있어 종래에 널리 사용되던 CRTCCathode Ray Tube)의 단점을 극복할 수 있는 대체 수단으로 주목을 받아왔고， 현재는 디스플레이 장치를 필요로 하는 거의 모든 정보 처리 기기에 장착되고 있는 실정이다. 이때， 이러한 액정표시 장치는 일반적으로 특정한 분자 배열을 갖는 액정에 전압을 인가하여 다른 분자 배열로 변화시키고, 이러한 분자 배열의 변화에 의해 발생하는 액정의 복굴절성， 선광성， 2 색성 및 광산란 특성 등의 광학적 성질의 변화를 시각 변화로 변환하는 것으로서， 액정에 의한 빛의 변조를 이용한 디스플레이 장치 이다 . 자체 발광원이 없는 수광형 소자인 액정표시장치는 소자의 화면 전체를 조명할 수 있는 별도의 광원 장치가 필요한데， 이러한 액정표시장치용 조명 장치를 통상 백라이트 유닛 (Back Light Uni t )이라 한다. 한편 , 일반적으로 백라이트 유닛은 발광 램프가 배치되는 , 방식에 따라 에지 (edge) 방식과 직하 방식으로 구별한다. 에지 방식은 발광 램프로부터 발생한 빛을 안내하는 도광판의 축면에 발광 램프가 배치되는 방식으로서， 데스크 탑 컴퓨터나 노트북용 모니터와 같이 비교적 소형 인 액정표시장치에 적용되는 것으로서 빛의 균일성 이 좋고， 내구성 이 우수하며， 장치의 박형화에 유리하다. 이에 반해 , 직하 방식은 20인치 이상의 중대형 표시장치에 사용되기 위해 개발되 었으며， 액정 패널의 하부에 다수의 램프 광원을 배열시켜 액정 패널의 전면을 직접 조명하는 방식 이다 . 백라이트 유닛용 발광 램프에는 종래부터 냉음극형광램프 (Cold Cathode Fluorescent Lamp , 이하 "CCF^"이라 함)와 같은 선형 광원이 많이 이용되고 있으나， 근래에는 색재현성 이 CCFL보다 우수하고 친환경 적며， 박형화， 경량화 및 저 전력을 위해 발광 다이오드 (LED)로 대체되고 있는 추세에 있다. 한편， 종래의 백라이트 유닛에는 광원으로부터 발생한 빛을 확산 또는 집광하거나 휘도의 향상 또는 램프 무라의 감소 등의 목적으로 다수의 광학필름이 함께 사용된다. 도 1은 종래 직하형 백라이트 유닛을 예시적으로 나타낸 것으로， 반사판 (1) 상에 다수의 광원 (2)이 배열되어 있고, 광원 상부에는 화면 전체의 밝기를 고르게 하고 광학필름들의 지지대 역할을 하기 위한 확산판 (3)이 사용된다. 확산판 (3)에 의해 확산된 광을 유효 시청 범위로 집광하고 화면 밝기의 균일도를 증가하기 위해 1매 이상의 확산필름 (4) 및 집광필름 (5)을 사용할 수 있다. 이와 같은 백라이드 유닛에 사용되는 집광필름으로는 프리즘 필름, 렌티클러 필름 또는 마이크로 렌즈 어레이 (Micro Lens Array, MLA) 시트 등이 있다. 상기 마이크로 렌즈 어레이 시트는 집광 기능 및 확산 기능을 함께 수행하지만, 도 2에 도시된 바와 같이 마이크로 렌즈 어레이 시트 상의 마이크로 렌즈가 주기적으로 배열되는 경우 다른 주기적 배열 또는 패턴을 갖는 광학 시트나 일정한 주기의 픽셀 (Pixel)들로 이루어진 LCD 패널과 겹쳐지면 기하학적인 간섭에 의해 모아레 (Moire) 현상을 발생시키게 된다. 이때， 모아레 (Moire)는 두 개 이상의 주기적인 패턴이 겹쳐졌을 때 발생하는 간섭 패턴을 일컫는 말로써， 비슷한 주기의 명암 패턴을 갖는 두 개의 광학 필름이 겹쳐지게 되면 그 결과 새로운 명암 패턴이 생성되는데 이것이 바로 모아레 현상이다. 모아레는 LCD에서 구현되는 영상에 불필요한 패턴을 형성하게 되므로 이를 회피 또는 제거할 수 있는 방안들이 요구되며， 모아레를 희피하는 한 방법으로는 겹쳐진 각 패턴의 주기성을 없애는 방법이 있을 수 있다. 그러나， 이 경우 휘도의 급격한 감소를 가져을 수 있다. 한편， 이와 같은 영상표시 장치에 있어서 휘도와 시야각은 매우 중요한 특성이며， 이는 백라이트 유닛을 구성하는 광학시트의 특성에 의해 결정되는 것으로 알려져 있다. 최근 반구형 마이크로 렌즈 어레이 시트가 널리 사용돠고 있으나， 이러한 반구형 마이크로 렌즈 어레이 시트는 휘도 상승에 한계가 있고, 시야각 특성을 개선하면 휘도가 상대적으로 낮아지는 문제가 있다. 따라서， 휘도의 감소를 최소화하면서도 모아레를 개선할 수 있는 마이크로 렌즈의 배열을 갖는마이크로 렌즈 어레이 시트가 요구된다. In general, a liquid crystal display device is an electronic device that transmits various electrical information generated by various devices to visual information by using a change in liquid crystal transmittance depending on an applied voltage. Liquid crystal displays have been attracting attention as an alternative means to overcome the shortcomings of CRTCCathode Ray Tubes, which have been widely used since they have advantages such as miniaturization, light weight, and low power consumption. It is a situation that is installed in all information processing equipment. In this case, such a liquid crystal display device generally applies a voltage to a liquid crystal having a specific molecular arrangement to change it into another molecular arrangement, and the birefringence, light beneficiation, dichroism, and light scattering characteristics of the liquid crystal generated by the change of the molecular arrangement Optical It is a display device that converts a change into a visual change and uses modulation of light by liquid crystal. A liquid crystal display device, which is a light-receiving element without a self-luminous source, requires a separate light source device capable of illuminating the entire screen of the device. Such an illumination device for a liquid crystal display device is commonly referred to as a backlight unit. On the other hand, in general, the backlight unit is distinguished from the edge method and the direct method according to the manner in which the light emitting lamp is arranged. The edge method is a method in which a light emitting lamp is disposed on an axis of a light guide plate for guiding light generated from a light emitting lamp. The edge method is applied to a relatively small liquid crystal display such as a monitor for a desktop computer or a notebook and has good light uniformity and durability. This is excellent and is advantageous for thinning the device. On the other hand, the direct method was developed to be used in a medium-to-large display device of 20 inches or more, and a method of directly illuminating the front of the liquid crystal panel by arranging a plurality of lamp light sources under the liquid crystal panel. Conventionally, a linear light source such as a cold cathode fluorescent lamp (CCF ^) has been widely used in the light emitting lamp for a backlight unit. However, in recent years, color reproducibility is superior to CCFL, it is less environmentally friendly, thinner, There is a trend to be replaced by light emitting diodes (LEDs) for light weight and low power. Meanwhile, a conventional backlight unit includes a plurality of backlight units for the purpose of diffusing or condensing light generated from a light source, improving luminance, or reducing lamp mura. Optical film is used together. 1 illustrates a conventional direct backlight unit by way of example, and a plurality of light sources 2 are arranged on a reflector plate 1, and the upper part of the light source is used to uniform the brightness of the entire screen and serve as a support for the optical films. The diffuser plate 3 is used. One or more diffuser films 4 and 5 may be used to focus the light diffused by the diffuser plate 3 into the effective viewing range and to increase the uniformity of the screen brightness. Condensing films used in such a back light unit include a prism film, a lenticular film or a micro lens array (MLA) sheet. The microlens array sheet performs both a condensing function and a diffusing function, but as shown in FIG. 2, when the microlenses on the microlens array sheet are periodically arranged, an optical sheet having a different periodic arrangement or pattern or pixels having a constant period When overlapped with LCD panels made of pixels, Moire phenomenon occurs due to geometric interference. In this case, Moire refers to an interference pattern generated when two or more periodic patterns overlap, and when two optical films having similar light and dark patterns overlap, a new light and dark pattern is generated. This is the moiré phenomenon. Moire avoids this because it forms an unnecessary pattern in the image implemented in LCD. Alternatively, there is a need for ways to remove it, and one way to avoid moiré is to eliminate the periodicity of each overlapping pattern. However, in this case, the luminance may be drastically reduced. On the other hand, in such an image display device, the brightness and the viewing angle are very important characteristics, which are known to be determined by the characteristics of the optical sheet constituting the backlight unit. Recently, the hemispherical microlens array sheet has been widely used, but such a hemispherical microlens array sheet has a limitation in increasing the luminance, and when the viewing angle characteristic is improved, the luminance is relatively low. Therefore, there is a need for a micro lens array sheet having an array of micro lenses capable of improving moiré while minimizing a decrease in luminance.
【발명의 상세한 설명】  [Detailed Description of the Invention]
【기술적 과제]  [Technical problem]
이에 본 발명의 한 측면은 우수한 휘도를 유지하면서 모아레가 개선된 마이크로 렌즈 어레이 시트를 제공하는 것이다. 이에 본 발명의 다른 측면은 코닉 (conic) 렌즈로 이루어진 휘도 및 시야각이 향상된 마이크로 렌즈 어레이 시트를 제공하는 것이다. 이에 본 발명의 또 다른 측면은 상기 마이크로 렌즈 어레이 시트를 포함하여 모아레가 개선되고， 휘도 및 시야각이 향상된 백라이트 유닛을 제공하는 것이다. Accordingly, one aspect of the present invention is to provide a micro lens array sheet with improved moiré while maintaining excellent brightness. Accordingly, another aspect of the present invention is to provide a micro lens array sheet having improved luminance and viewing angle made of a conic lens. Thus another aspect of the present invention includes the micro lens array sheet Moire is improved, and to provide a backlight unit with improved brightness and viewing angle.
[기술적 해결방법:! [Technical solution :!
본 발명의 일 견지에 의하면, 기재부 및 상기 기재부의 일면 상에 형성된 복수의 마이크로 렌즈를 포함하고， 상기 복수의 마이크로 렌즈는 불규칙 배열을 가지며， 서로 인접하는 2개의 마이크로 렌즈의 중심점들 사이의 거리들의 표준편차가, 하나의 마이크로 렌즈를 선택해 상기 선택한 마이크로렌즈의 중심점에서 인접하는 마이크로렌즈들 사이 평균 피치 (p)의 인 마이크로 렌즈 어레이 시트가 제공된다. 본 발명의 또 다른 견지에 의하면， 상기 마이크로 렌즈 어레이 시트를 포함하는 백라이트 유닛이 제공된다. 아때， 상기 백라이트 유닛은 상기 마이크로 렌즈 어레이 시트를 2장 포함하는 것이 바람직하다. According to an aspect of the present invention, a base portion and a plurality of micro lenses formed on one surface of the base portion, wherein the plurality of micro lenses have an irregular arrangement, the distance between the center points of two adjacent micro lenses Standard deviation of the microlens array sheet is provided, in which one microlens is selected to have an average pitch p between adjacent microlenses at a center point of the selected microlens. According to still another aspect of the present invention, a backlight unit including the micro lens array sheet is provided. In some embodiments, the backlight unit may include two sheets of the micro lens array sheet.
【유리한 효과】  Advantageous Effects
본 발명에 의하면 마이크로 렌즈 어레이 시트의 마이크로 렌즈 주기성을 제거하여 모아레 현상을 방지하며 , 휘도의 감소를 최소화 할 수 있다. 또한， 코닉 렌즈로 이루어진 마이크로 렌즈 어레이 시트를 이용하여 휘도 및 시야각의 특성을 동시에 개선시킬 수 있다. 따라서 액정 패널에 사용되는 경우 모아레에 의한 명암 패턴이 감소된 고품격의 화면을 제공할수 있다. 【도면의 간단한 설명】 According to the present invention, by removing the microlens periodicity of the microlens array sheet, it is possible to prevent the moiré phenomenon and to minimize the decrease in luminance. In addition, it is possible to improve the characteristics of the brightness and viewing angle at the same time by using a micro lens array sheet made of a conic lens. Therefore, when used in a liquid crystal panel, it is possible to provide a high quality screen in which the contrast pattern caused by moiré is reduced. [Brief Description of Drawings]
도 1은 예시적인 공지의 백라이트 유닛의 구성을 개략적으로 나타낸 것이다. 도 2는 마이크로 렌즈가 허니캄 (Honeycomb) 배열을 갖는 예시적인 공지의 마이크로 렌즈 어레이 시트의 마이크로 렌즈 배치를 렌즈의 밑면을 개략적으로 도시하여 나타낸 것이다. 1 schematically illustrates a configuration of an exemplary known backlight unit. FIG. 2 schematically shows the microlens placement of an exemplary known microlens array sheet in which the microlens has a Honeycomb arrangement, showing schematically the underside of the lens.
도 3은 일정한 변위 내에서 랜덤 배열을 갖는 본 발명의 예시적인 마이크로 렌즈 어레이 시트의 마이크로 렌즈 배치를 렌즈의 밑면을 개략적으로 도시하여 나타낸 것이며， 도 4는 '상기와 같은 렌즈 배치를 갖는 마이크로 렌즈 어레이 시트의 사시도이다. FIG. 3 schematically shows the microlens arrangement of an exemplary microlens array sheet of the present invention having a random arrangement within a constant displacement, showing schematically the underside of the lens, and FIG. 4 shows the microlens array having the lens arrangement as described above. A perspective view of a sheet.
도 5는 본 발명의 일 구현에 따른 백라이트 유닛의 구성을 개략적으로 나타낸 것이다. 5 schematically shows a configuration of a backlight unit according to an embodiment of the present invention.
도 6은 본 발명의 실시예 1의 집광 필름 2매를 약 5도 정도 회전하여 적층한 후 읍티컬리서치어소시에아츠 (Optical Research Associates)의 LightTools을 이용해 모아레 현상을 측정한 것이다. FIG. 6 illustrates a moiré phenomenon using LightTools of Optical Research Associates after stacking two light collecting films of Example 1 by rotating about 5 degrees.
도 7은 본 발명의 실시예 2의 집광 필름 2매를 약 5도 정도 회전하여 적층한 후 옵티컬리서치어소시에이츠 (Optical Research Associates)의 LightTools을 이용해 모아레 현상을 측정한 것 ᅵ다. FIG. 7 shows a moiré phenomenon measured using optical tools of Optical Research Associates after stacking two light collecting films of Example 2 by rotating about 5 degrees.
도 8은 본 발명의 비교예 1의 집광 필름 2매를 약 5도 정도 회전하여 적층한 후 읍티컬리서치어소시에이츠 (Optical Research Associates)의 LightTools을 이용해 모아레 현상을 측정한 것이다. FIG. 8 shows the moiré phenomenon using LightTools of Optical Research Associates after stacking two light collecting films of Comparative Example 1 of the present invention by rotating about 5 degrees.
도 9는 본 발명의 비교예 2의 집광 필름 2매를 약 5도 정도 회전하여 적층한 후 읍티컬리서치어소시에이츠 (Optical Research Associates)의 LightTools을 이용해 모아레 현상을 측정한 것이다. 9 is laminated after rotating the two light collecting film of Comparative Example 2 of the present invention by about 5 degrees Moiré phenomena were measured using LightTools from Optical Research Associates.
【발명의 실시를 위한 최선의 형태】 [Best form for implementation of the invention]
이하， 도면을 참고하여 본 발명을 보다상세하게 설명한다. 본 발명은 기재부， 및 상기 기재부의 일면 상에 형성된 복수의 마이크로 렌즈를 포함하고， 상기 복수의 마이크로 렌즈는 불규칙 배열을 가지며, 서로 인접하는 2개와 마이크로 렌즈의 증심점들 사이의 거리들와 표준편차가， 하나의 마이크로 렌즈를 선택해 상기 선택한 마이크로렌즈의 중심점에서 인접하는 마이크로렌즈들 사이 평균 피치 (P)의 인 마이크로 렌즈 어레이 시트에 관한 것이다. 본 발명은 마이크로 렌즈의 배치에 있어서， 인접하는 2개의 마이크로 즈의 중심점들 사이의 거리들의 표준편차;가， 하나의 마이크로 렌즈를 선택해 상기 선택한 마이크로렌즈의 중심점에서 인접하는 마이크로렌즈들 사이 평균 피치 (p)의 2-20%인 것이 바람직하며， 평균 피치 (P)의' 2~14¾>인 것이 더욱 더 바람직하며， 평균 피치 (P)의 2~9%인 것이 가장 바람직하다. 상기 표준편차가 2%보다 작으면 마이크로 렌즈 주기성 감소를 통한 모아레 현상의 개선 효과가 없고, 상기 표준편차가 20%보다크면 휘도가 감소하는 큰 문제점이 있다. 이때, 본 발명에 있어서， 상기 마이크로 렌즈들은 상기 범위를 만족시키는 동시에 불규칙 배열을 갖는 것이 보다 바람직하다. 만일 마이크로 렌즈의 배열이 본 발명의 표준편차를 만족하면서 규칙적 배열을 가지게 되면, 마이크로 렌즈 배열의 주기성 때문에 모아레 현상이 발생하는 문제점이 있다. 또한, 본 발명의 마이크로 렌즈 어레이 시트에 있어서， 상기 인접한 렌즈 중심점 사이의 거리들의 평균값 (평균 피치， P)은 10/ffl -500/iffl인 것이 바람직하다. 평균값이 lOjum보다 작으면， 렌즈 금형 제작에 어려움이 있으며， 500im보다 크면 렌즈의 높이가 커져서 렌즈의 부피 증가로 제조 원가가 상승하고， 외관상 렌즈의 형상이 쉽게 시인되며， 광 분포의 균일성을 떨어뜨려 외관 품질을 떨어뜨릴 수 있기 때문이다. 바람직하게는， 본 발명의 마이크로 렌즈는， 도 2에 나타난 바와 같이 서로 인접하는 3개의 마이크로 렌즈의 중심점을 연결하여 형성되는 삼각형을 기본 배열 단위 (A1 내지 A6)로 하여 배열될 수 있다. 이때, LI, L2 및 L3는상기 기본 배열 단위인 삼각형의 각 변의 길이를 나타내고， Θ1, Θ2 및 Θ3 는 상기 기본 배열 단위인 삼각형의 각 내각의 각도를 나타낸다. 한편， 본 발명에 있어서， 마이크로 렌즈들의 중심점을 연결하여 형성되는 상기 삼각형들은 서로 상이한 면적을 갖도록 형성되는 것이 바람직하다. 이때， 상기 기본 배열 단위인 삼각형들의 면적 변동율은 2~20¾인 것이 바람직하며， 2~9%인 것이 가장 바람직하다. 면작 변동율이 2%보다 작으면 마이크로 렌즈 어레이 시트의 마이크로 렌즈 주기성 감소를 통한 모아레 현상의 개선에 대한 효과가 없고, 면적 변동율이 20¾보다 크면 휘도가 감소하는 큰 문제점이 있다. 또한, 본 발명의 상기 마이크로 렌즈 어레이 시트에 있어서， 전체 기본 배열 단위 증 정삼각형인 기본 배열 단위의 비율이 50% 미만인 것이 바람직하다. 도 2 에는， 종래의 마이크로 렌즈 어레이 시트의 렌즈 배열이 개시되어 있다. 도 2에 도시된 바와 같이， 종래의 마이크로 렌즈 어레이 시트는， 각 렌즈의 중심점을 연결하여 형성되는 삼각형이 정삼각형을 이루는 허니컴 배열과 같은 규칙적인 배열로 형성하는 것이 일반적이었다. 그러나， 이와 같은 마이크로 렌즈 어레이 시트가 적층되거나 일정한 주기의 픽샐 (Pixel)들로 이루어진 LCD 패널과 겹쳐지는 경우， 모아레가 발생하게 되고， 그 결과 화상표시장치의 화질이 저하된다는 문제점이 있었다. 이에 비해, 본 발명의 마이크로 렌즈 어레이 시트는 상기와 같이 기본적으로 삼각형 배열을 유지하면서， 기본 배열 단위에 변형을 가함으로써, 모아레를 감소시키면서， 휘도가 저하되는 것을 방지할 수 있다. 한편， 유의미한 모아레 감소 효과를 얻기 위해서는 상기 기본 배열 단위 중 정삼각형인 배열 단위의 비율이 전체의 50%미만인 것이 바람직하다. 한편， 본 발명은 마이크로 렌즈의 배치에 있어서， 정삼각형을 형성하는 배열 단위를 포함하지 않는 것이 보다 바람직하며 , 상기 배열 단위는 하기 식 (1) 또는 식 (2)를 만족하는 것이 바람직하고， 가장 바람직하게는 하기 식 (1) 및 하기 식 (2)를 동시에 만족한다. Hereinafter, the present invention will be described in more detail with reference to the drawings. The present invention includes a base portion, and a plurality of micro lenses formed on one surface of the base portion, wherein the plurality of micro lenses have an irregular arrangement, and distances and standard deviations between two adjacent ones and the thickening points of the micro lenses. The present invention relates to a microlens array sheet, in which one microlens is selected to have an average pitch P between adjacent microlenses at a center point of the selected microlens. The present invention relates to a standard deviation of distances between centers of two adjacent micros in the arrangement of microlenses; a) selecting one microlens and an average pitch between adjacent microlenses at the center of the selected microlens. It is preferably 2-20% of p), even more preferably ' 2-14¾> of the average pitch P, most preferably 2-9% of the average pitch P. If the standard deviation is less than 2%, there is no improvement effect of the moiré phenomenon through the reduction of the periodicity of the micro lens, and if the standard deviation is greater than 20%, there is a big problem that the luminance decreases. In this case, in the present invention, the micro lenses satisfy the above range. It is more preferable to have an irregular arrangement at the same time. If the arrangement of the microlenses has a regular arrangement while satisfying the standard deviation of the present invention, the moiré phenomenon may occur due to the periodicity of the microlens arrangement. Further, in the microlens array sheet of the present invention, it is preferable that the average value (average pitch, P) of the distances between the adjacent lens center points is 10 / ffl -500 / iffl. If the average value is smaller than lOjum, it is difficult to manufacture the lens mold. If the average value is larger than 500im, the height of the lens increases, which increases the manufacturing cost due to the increase of the volume of the lens, the appearance of the lens is easily recognized, and the uniformity of the light distribution decreases. This can lower the appearance quality. Preferably, as shown in FIG. 2, the microlenses of the present invention may be arranged using the triangles formed by connecting center points of three adjacent microlenses as basic array units A1 to A6. In this case, LI, L2 and L3 represent the length of each side of the triangle which is the basic arrangement unit, and Θ1, Θ2 and Θ3 represent the angle of each inner angle of the triangle which is the basic arrangement unit. Meanwhile, in the present invention, the triangles formed by connecting the center points of the micro lenses are preferably formed to have different areas. In this case, the area variation rate of the triangles that are the basic arrangement unit is 2 ~ 20¾ It is preferable and it is most preferable that it is 2 to 9%. If the cultivation rate is less than 2%, there is no effect on the improvement of the moiré phenomenon by reducing the microlens periodicity of the microlens array sheet, and if the area variability is greater than 20¾, there is a big problem that the luminance decreases. Further, in the microlens array sheet of the present invention, it is preferable that the ratio of the basic array units which are all basic array unit presentation triangles is less than 50%. 2 shows a lens arrangement of a conventional micro lens array sheet. As shown in FIG. 2, it is common to form a conventional micro lens array sheet in a regular array such as a honeycomb array in which triangles formed by connecting center points of respective lenses form an equilateral triangle. However, when such micro lens array sheets are stacked or overlapped with LCD panels made of pixels of a certain period, moiré occurs, and as a result, the image quality of the image display apparatus is deteriorated. On the other hand, the microlens array sheet of the present invention can prevent the brightness from being lowered while reducing the moiré by modifying the basic array unit while basically maintaining the triangular array as described above. On the other hand, in order to obtain a significant moiré reduction effect, it is preferable that the ratio of the arrangement unit which is an equilateral triangle among the said basic arrangement units is less than 50% of the whole. On the other hand, in the arrangement of the microlenses, the present invention more preferably does not include an array unit forming an equilateral triangle, and the array unit is represented by the following formula (1) or It is preferable to satisfy Formula (2), Most preferably, following Formula (1) and Formula (2) are satisfied simultaneously.
0.8 X P < LI, L2, L3< 1.2 x P 식 (1) ' 0.8 XP <LI, L2, L3 <1.2 x P (1) '
48° <Θ1, Θ2, Θ3 < 72° 식 (2) 이때, 상기 식 (1)에서, LI, L2 및 L3은 상기 배열 단위의 각 변의 길이이며， Ρ는 마이크로렌즈의 평균 피치이다. 또한， 상기 식 (2)에서， Θ1, Θ2 및 Θ3는 상기 배열 단위의 각 내각의 각도이다. 여기서， 본 발명의 마이크로 렌즈 배열 단위의 각 변의 길이가 평균 피치 (Ρ)의 80% 미만이거나 120%를 초과하는 경우 휘도가 현저히 저하되는 문제가 있으며， 한편 배열 단위의 각 내각의 각도가 48 ° 미만이거나 72 ° 를 초과하는 경우 역시 휘도가 현저히 저하되는 문제가 있다. 즉, 마이크로 렌즈 어레이 시트에 있어서， 모아레의 감소를 위해 마이크로 렌즈의 랜덤 배치를 고려할 수 있으나， 무작위 랜덤 배치의 경우, 마이크로 렌즈 어레이 시트의 휘도가 현저하게 감소되는 경향이 있으며， 라서 본 발명은 상기와 같이 일정한 범위 내의 제한된 랜덤 배치를 통해 휘도의 감소를 최소화 하면서도 모아레를 감소시킨 마이크로 렌즈 어레이 시트를 제조할 수 있도록 하였다. 한편， 본 발명에 채용될 수 있는 마이크로 렌즈의 형상은 반구， 원뿔， 코닉 (conic) 및 타원으로 이루어진 그룹으로부터 선택되는 것이 바람직하나, 이에 제한되는 것은 아니며， 다각뿔, 다각뿔대， 기타 비구면 렌즈 등도 본 발명의 렌즈 배치에 사용될 수 있다. 48 ° <Θ1, Θ2, Θ3 <72 ° Equation (2) In this equation, LI, L2 and L3 are the lengths of the sides of the array unit, and Ρ is the average pitch of the microlenses. In addition, in Equation (2), Θ1, Θ2 and Θ3 are angles of the respective internal angles of the array unit. Here, when the length of each side of the microlens array unit of the present invention is less than 80% or more than 120% of the average pitch (Ρ), there is a problem that the brightness is significantly reduced, while the angle of each cabinet angle of the array unit is 48 ° If it is less than or exceeds 72 ° , there is also a problem that the brightness is significantly lowered. That is, in the microlens array sheet, although the random arrangement of the microlenses may be considered for the reduction of moiré, in the case of the random random placement, the luminance of the microlens array sheet tends to be significantly decreased. Through a limited random placement within a certain range, such as to minimize the reduction in brightness while producing a micro lens array sheet with reduced moiré It was. On the other hand, the shape of the micro lens that can be employed in the present invention is preferably selected from the group consisting of hemispheres, cones, conic and ellipses, but is not limited thereto, polypyramids, polygonal pyramids, other aspherical lenses, etc. It can be used in the lens arrangement of the invention.
또한， 상기 마이크로 렌즈의 평균 직경 (D)은 평균 피치의 90 % 내지 126 %인 것이 바람직하며， 직경아 평균 피치와 90 % 미만인 경우 일반적인 마이크로렌즈 배열을 갖는 필름에서 조차 휘도 상승 효과가 낮은 문제가 있으며， 피치의 126 % 를 초과하는 경우 본 발명에서 제안하는 랜덤 배치 범위 내에서 공극률이 0이 될 수 있는 렌즈의 직경을 초과하는 것으로 돌출되는 렌즈를 정의하는데 무의미하다. 나아가， 기재부 상에 배치되는 마이크로 렌즈는 밑면의 직경 (D)이 상이할 수 있으나， 바람직하게는 직경이 동일한 마이크로 렌즈를 사용한다. 직경이 동일한 마이크로 렌즈를 사용하여 본 발명의 제한된 랜덤 배치를 수행하는 경우 휘도 감소를 최소화하면서 모아레를 개선하기 위한 렌즈 배치의 조절이 보다 용이하다. 덧붙여， 본 발명에 있어서, 마이크로 렌즈의 높이는 평균 피치의 20 % 내지 100 ¾>인 것이 바람직하며， 높이가 평균 피치의 20 % 미만인 경우 일반적인 마이크로 렌즈 배열에서조차 휘도 상승 효과가 낮은 경향이 있으며, 피치의 100 % 를 초과하는 경우 제작이 용이하지 않을 뿐만 아니라 일반적인 마이크로 렌즈 배열에서 조차 휘도 상승 효과가 탁월하지 않은 경향이 있다. 한편， 상기 렌즈들의 높이는 상이할 수 있으나， 동일한 높이의 마이크로 렌즈를 사용하여 본 발명의 제한된 랜덤 배치를 수행하는 경우 휘도 감소를 최소화하면서 모아레를 개선하기 위한 렌즈 배치의 조절이 보다 용이하다. 한편, 본 발명의 마이크로 렌즈는 코닉 (conic)형태의 렌즈일 수 있으며, '코닉 렌즈'는 렌즈 밑면이 원 형태이며 렌즈 중앙의 세로 단면이 쌍곡선 및 포물선인 경우를 포함하는 곡면을 모두 포함하지만， 렌즈 중앙의 세로 단면이 삼각형인 원뿔형 렌즈， 그 단면이 반원형인 반구형 렌즈 및 그 단면이 타원형인 타원형 렌즈를 제외한 것을 의미한다. 이때， 상기 코닉 렌즈의 형태는 하기 식 (3)으로부터 특정될 수 있으며， 하기 식 에서 H는 코닉 렌즈의 밑면에서 가상의 정점까지의 높이이고， r은 렌즈의 최정점 에서와 곡를반경을 나타내며, k는 코닉 (conic) 상수를 나타낸다. 일반적으로 곡 면 렌즈의 형상은 렌즈의 정점에서의 곡를 반경 (r)과 코닉상수 (k)를 변수로 하는 함수로 표시된다. 이 때 상기 코닉 상수 k는 렌즈의 형상을 결정하는 것으로, k=0이면 원형， k=-l이면 포물선 형태의 렌즈를 나타내고, -l<k<0이면 타원형 렌 즈로 나타나며， k<-l이면 쌍곡선 형태의 렌즈가나타난다. In addition, it is preferable that the average diameter (D) of the microlenses is 90% to 126% of the average pitch, and when the diameter is less than 90% of the average pitch, the problem of low luminance increase even in a film having a general microlens arrangement is problematic. In addition, if it exceeds 126% of the pitch, it is meaningless to define a lens that protrudes by exceeding the diameter of the lens where the porosity may be zero within the random arrangement range proposed by the present invention. Further, the microlenses disposed on the substrate portion may have different diameters (D) of the bottom surface, but preferably microlenses having the same diameter are used. When performing the limited random placement of the present invention using microlenses of the same diameter, it is easier to adjust the lens placement to improve moiré while minimizing brightness reduction. In addition, in the present invention, the height of the microlenses is preferably 20% to 100 3/4> of the average pitch, and when the height is less than 20% of the average pitch, the luminance increase effect tends to be low even in a general microlens arrangement. 100% If it exceeds, it is not only easy to fabricate, but even the general microlens arrangement tends not to be excellent in brightness enhancement. On the other hand, the height of the lenses may be different, it is easier to adjust the lens arrangement to improve the moiré while minimizing the brightness reduction when performing the limited random placement of the present invention using the same height microlenses. Meanwhile, the microlens of the present invention may be a conic-type lens, and the 'conic lens' includes all curved surfaces including a case in which the bottom surface of the lens is circular and the vertical cross section of the center of the lens is hyperbolic and parabolic. It means a conical lens having a triangular vertical cross section at the center of the lens, a hemispherical lens having a semicircular cross section, and an elliptical lens having an elliptical cross section. At this time, the shape of the conic lens can be specified from the following equation (3), in which H is the height from the bottom of the conic lens to the imaginary vertex, r represents the radius of the curve and at the peak of the lens, k Denotes a conic constant. In general, the shape of a curved lens is expressed as a function of the curve at the vertex of the lens as the radius (r) and the conic constant (k) as variables. At this time, the koenic constant k determines the shape of the lens. If k = 0, it represents a circular shape, if k = −l, it represents a parabolic lens, and if −l <k <0, an elliptical lens appears, and if k <−l, Hyperbolic lens appears.
l+Vl-(l+k)(l/r)½2 즉, 본 발명에 있어서, 상기 코닉 렌즈의 코닉 상수 (k)는 -3 내지 -1이며， -2.8 내지 -1.5인 것이 보다 바람직하다. 또한， 상기 코낙 렌즈 정점에서의 곡를 반경 (r)은 상기 평균 피치 (P)의 0.2% 내지 26%인 것이 바람직하며， 보다 바람직하게는 내지 20%인 것이다. 0.2%미만인 경우 제품의 양산 시 정점에 대해 불량이 발생하거나 스크래치에 취약할 수 있으쪄， 기포 발생, 생산 시간 지연 등의 문제가 발생할 수 있고， 26%를 초과하는 경우 집광 효율에 문제가 있다. 본 발명의 예시적인 마이크로 렌즈의 배열을 도 3 및 4에 도시하였으며， 도 3는 밑면이 원인 마이크로 렌즈의 배열을 예시적으로 나타낸 것이며， 도 4는 마이크로 렌즈가 본 발명에 따라 배치된 본 발명의 예시적인 마이크로 렌즈 어레이 시트의 사시도를 나타낸 것이다. 다음으로 본 발명의 마이크로 렌즈 어레이 시트의 제조 방법을 살펴본다. 금형을 이용한 마이크로 렌즈 어레이 시트의 제조 방법은 당해 기술 분야에 잘 알려져 있으며， 당업자는 본 명세서의 기재 사항과 종래 기술을 참조하여 본 발명의 마이크로 렌즈 어레이 시트를 제조할 수 있올 것이다. 예를 들어, 본 발명의 마이크로 렌즈 어레이 시트는 열가소성 수지 등을 압출하여 필름 형태로 성형하여 기재부를 형성한후 광출사면에 본 발명의 렌즈 형상이 음각된 를형 또는 판형의 금형과 기재부 사이에 경화성 수지를 주입하여 필름의 광 출사면에 원하는 패턴을 하고, 패턴이 형성된 필름에 자외선 또는 열을 조사하여 경화시키는 방법으로 본 발명의 마이크로 렌즈 어레이 시트를 제조할수 있다. l + Vl- (l + k) (l / r) ½ 2 That is, in the present invention, the conic constant (k) of the conic lens is -3 to -1, more preferably -2.8 to -1.5. Moreover, it is preferable that the radius r of the music | curd at the said Konak lens vertex is 0.2%-26% of the said average pitch P, More preferably, it is 20%. If it is less than 0.2%, it may be defective or vulnerable to scratch at the time of mass production of the product, there may be problems such as bubble generation and production time delay, and if it exceeds 26%, there is a problem in light collection efficiency. An arrangement of exemplary microlenses of the present invention is shown in FIGS. 3 and 4, FIG. 3 is an illustration of an arrangement of microlenses caused by a bottom surface, and FIG. 4 of the present invention in which microlenses are arranged in accordance with the present invention. A perspective view of an exemplary micro lens array sheet is shown. Next, look at the manufacturing method of the microlens array sheet of the present invention. Methods for producing a microlens array sheet using a mold are well known in the art, and those skilled in the art will be able to manufacture the microlens array sheet of the present invention with reference to the description herein and the prior art. For example, the microlens array sheet of the present invention is formed between a mold and a plate-shaped mold and a base portion of which the lens shape of the present invention is engraved on the light exit surface after forming a base portion by extruding a thermoplastic resin or the like into a film form. The microlens array sheet of the present invention can be produced by injecting a curable resin into a desired pattern on the light exit surface of the film and irradiating ultraviolet rays or heat to the film on which the pattern is formed.
한편， 본 발명의 상기 코닉 렌즈는 기재 상부에 코닉 렌즈 형상이 음각된 금형을 두고 경화성 수지 용액를 흘려 넣은 후 아를 경화시키는 방법으로 형성할 수 있으며， 비대칭 비드를 배열하는 방식, 레이저를 이용하여 마스크 식각 및 직가공하는 방식， 포토리소그라피를 이용한 제작방식 등에 의해 형성될 수 있다. 또한， 본 발명에서 사용 가능한 경화성 수지로는 우레탄 아크릴레이트, 에폭시 아크릴레이트， 에스테르 아크릴레이트 또는 라디칼 발생형 모노머 등을 들 수 있으며， 이들은 각각 단독으로 또는 흔합하여 사용될 수 있으나， 다만 이에 제한되는 것은 아니다. 다양한 형태가 음각된 금형을 이용하여， 다양한 형상, 높이 및 피치를 갖는 렌즈를 형성할 수 있다. 이때， 상기 금형에서 광 출사면의 렌즈 형상은 당해 기술 분야에 잘 알려진 종래의 금형 제조 방법， 예를 들면， 기계적 절삭， 포토레지스트 리플로우 방식, 포토레지스트 레이저 노광 방식， 비드 코팅， 레이저 식각 등의 방법 등을 통해 얻을 수 있다. 이때， 상기 금형은 평판, 무한궤도 또는 드럼 형태의 금형일 수 있으며, 니켈， 크롬과 같은 금속 또는 세라믹과 같은 단단한 재질 또는 폴리머나 실리카코팅된 폴리머 필름과 같은부드러운 재질로 이루어질 수 있다. 나아가, 본 발명은 상기 마이크로 렌즈 어레아시트를 포함하는 백라이트 유닛에 관한 것이다. 백라이트 유닛은 광원 및 상기 광원의 상부에 적어도 하나의 마이크로 렌즈 어레이 시트가 배치된다. 본 발명의 백라이트 유닛에 사용할 수 있는 마이크로 렌즈 어레이 시트는 상술한 바와 같으며， 본 발명의 마아크로 렌즈 어레이 시트는 광원부와 액정패널 사이에 배치하여 액정화면 디스폴레이에 사용된다. On the other hand, the conic lens of the present invention can be formed by placing a cured resin solution in a mold having a conic lens shape engraved on the substrate and then curing the ah, a method of arranging asymmetric beads, a mask using a laser It may be formed by an etching method and a direct processing method, a manufacturing method using photolithography, and the like. In addition, the curable resin usable in the present invention may include a urethane acrylate, epoxy acrylate, ester acrylate or a radical-generating monomer, and these may be used alone or in combination, but is not limited thereto. . Using a mold in which various shapes are engraved, lenses having various shapes, heights, and pitches can be formed. At this time, the lens shape of the light exit surface in the mold is known in the art, such as conventional mold manufacturing methods, such as mechanical cutting, photoresist reflow method, photoresist laser exposure method, bead coating, laser etching, etc. Through way etc. You can get it. In this case, the mold may be a flat plate, a caterpillar or a drum-type mold, and may be made of a hard material such as metal or ceramic such as nickel or chromium or a soft material such as polymer or silica coated polymer film. Furthermore, the present invention relates to a backlight unit including the micro lens array sheet. The backlight unit includes a light source and at least one micro lens array sheet on the light source. The microlens array sheet that can be used in the backlight unit of the present invention is as described above, and the microlens array sheet of the present invention is disposed between the light source unit and the liquid crystal panel and used for the liquid crystal display display.
이때， 상기 마이크로 렌즈 어레이 시트는 엣지형 백라이트에 적용되는 경우에는 도광판과 액정패널 사이에 적층되는 것이 바람직하며， 직하형 백라이트에 적용되는 경우 광원과 액정패널 사이에， 바람직하게는 확산판 상부에 배치된다. 광학시트의 하부로 손실되는 빛을 재활용하기 위해 광원의 하부에 반사율이 우수한 반사판을 장착하는 것이 바람직하다. 한편， 상기 광원의 하부라고 지칭하는 위치는 엣지형 백라이트의 경우에는 보다 명확하게 도광판의 하부를 지칭하는 것으로 이해된다. 한편， 본 발명의 백라이트 유닛에는 상술한 마이크로 렌즈 어레이 시트 이외에 추가의 광학필름이 포함될 수 있으며 , 추가될 수 있는 광학필름은 확산필름 또는 집광필름 등 당해 기술 분야에 알려진 어떠한 광학필름일 수 있으며， 이를 필요에 따라 적절하게 추가하여 구성할 수 있다 . 이때, 본 발명의 백라이트 유닛은 바람직하게는 상기 본 발명의 마이크로 렌즈 어레이 시트를 2장포함할 수 있다. 이하， 구체적인 실시예를 통해 본 발명을 보다 자세히 설명한다. 실시예 1 In this case, the microlens array sheet is preferably laminated between the light guide plate and the liquid crystal panel when applied to the edge type backlight, and is disposed between the light source and the liquid crystal panel when applied to the direct type backlight, preferably on the diffuser plate. do. In order to recycle the light lost to the lower part of the optical sheet, it is preferable to mount a reflector having excellent reflectance under the light source. On the other hand, the position referred to as the lower portion of the light source is understood to refer to the lower portion of the light guide plate more clearly in the case of the edge type backlight. On the other hand, the backlight unit of the present invention in addition to the above-described micro lens array sheet Additional optical films may be included, and the additional optical film may be any optical film known in the art, such as a diffusion film or a condensing film, and may be appropriately added and configured as necessary. In this case, the backlight unit of the present invention may preferably include two micro lens array sheets of the present invention. Hereinafter, the present invention will be described in more detail with reference to specific examples. Example 1
식 (3)에서 D=5 ffli, r=3 , k=-2.18인 코닉 렌즈들이， 기본적으로 피치 (P)가 50 인 허니컴 (honeycomb) 배열 구조를 가지면서 동시에 인접하는 2개의 렌즈의 중심점들 사이의 거리들의 표준편차가 2.3 이고, 기본 배열 단위인 삼각형들의 면적 변동율이 4.5%를 만족하도록 마이크로 렌즈들을 2차원적으로 배열한 집광 필름을 형성하였다. 실시예 2 In equation (3), conic lenses with D = 5 ffli, r = 3, k = -2.18, have a honeycomb array structure with a pitch P of 50, and at the same time the center points of two adjacent lenses A light condensing film in which microlenses were two-dimensionally arranged was formed such that the standard deviation of the distances between the two was 2.3 and the area variation rate of the triangles, which were the basic arrangement units, was 4.5%. Example 2
실시예 1에서 인접하는 2개의 렌즈의 중심점들 사이의 거리들의 표준편차가 9.2/ 이고 기본 배열 단위인 삼각형들의 면적 변동율이 18.5%를 만족하도록 마이크로 렌즈들을 2차원적으로 배열한 것을 제외하고는 다른 조건은 동일하게 집광 필름을 형성하였다. 비교예 1 Except that the microlenses were two-dimensionally arranged in Example 1 so that the standard deviation of the distances between the center points of two adjacent lenses was 9.2 / and the area variation rate of the triangles which were the basic arrangement units satisfies 18.5%. The conditions similarly formed the condensing film. Comparative Example 1
실시예 1에서 코닉 렌즈들을 2차원적으로 규칙적으로 배열한 집광 필름을 형성 하였다. 비교예 2 In Example 1, a condensing film was formed by regularly arranging conic lenses in two dimensions. Comparative Example 2
실시예 1에서 인접하는 2개의 렌즈의 중심점들 사이의 거리들의 표준편차가 0.6 이고 기본 배열 단위인 삼각형들의 면적 변동율이 를 만족하도록 마이크로 렌즈들을 2차원적으로 배열한 것을 제외하고는 다른 조건은 동일하게 집광 필름을 형성하였다. 상기 실시예 1~2， 비교예 1~2에서 각각의 집광 필름 2매를 백라이트 상에 적층함에 있어서 서로 약 5도 정도 회전되도록 하고 아 때의 중심 휘도값과 모아레 특성을 레이-트레이싱 프로그램 (Ray-tracing program, 읍티컬리서치어소시에이츠 (Optical Research Associates)의 LightTools)을 이용하여 시뮬레이션을 통해 측정하였다. 휘도 측정 결과는 하기 [표 1]과 같았으며, 모아레 특성은 실시예 1과 실시예 2 의 경우는 각각 [도 6]과 [도 기과 같았으며 비교예 1, 비교예 2 의 경우는 각각 [도 8]， [도 9] 과 같았다. 이 결과들에 따르면， 본 발명에 제안하는 렌즈 배열 방식에 따른 경우 (실시예 1과 실시예 2)에는 규칙적인 배열을 갖는 렌즈 배열 방식에 비해서 휘도의 감소도 적으면서 모아레 현상이 현저하게 개선되는 효과가 있음을 확인할 수 있다. The other conditions are the same except that the microlenses are two-dimensionally arranged so that the standard deviation of the distances between the center points of two adjacent lenses in Example 1 is 0.6 and the area variation rate of the triangles, which is the basic arrangement unit, is satisfied. Condensing film was formed. In Examples 1 and 2 and Comparative Examples 1 and 2, each of the light collecting films were rotated about 5 degrees from each other in lamination on the backlight, and the center luminance value and the moire characteristics of the light were measured by a ray-tracing program (Ray). The simulation was performed using a tracing program, LightTools of Optical Research Associates. The luminance measurement results were shown in the following [Table 1], and the moire characteristics of Example 1 and Example 2 were the same as those of [Fig. 6] and [Fig. 8] and [Fig. 9]. According to these results, according to the lens arrangement method proposed in the present invention (Examples 1 and 2), the luminance of the lens array method is higher than that of the lens array method having a regular array. It can be seen that there is an effect that the moiré phenomenon is remarkably improved while reducing the decrease.
[표 1]  TABLE 1
Figure imgf000019_0001
Figure imgf000019_0001
[부호의 설명]  [Description of the code]
D: 직경  D: diameter
LI, L2 및 L3: 배열 단위의 각 변의 길이  LI, L2, and L3: length of each side of the array unit
Θ1, Θ2 및 Θ3: 배열 단위의 각 내각의 각도  Θ1, Θ2, and Θ3: angles of each cabinet in array unit
A1내지 A6: 배열 단위  A1 to A6: array unit
10, 10': 마이크로 렌즈 어레이 시트  10, 10 ': Micro Lens Array Sheet
11： 도광판  11: light guide plate
12： 광원  12 ： light source
13： 반사판  13: reflector

Claims

【청구의 범위] [Claim]
【청구항 1】  [Claim 1]
기재부 및 상기 기재부의 일면 상에 형성된 복수의 마이크로 렌즈를 포함하고， 상기 복수의 마이크로 렌즈는 불규칙 배열을 가지며, 서로 인접하는 2개의 마이크로 렌즈의 중심점들 사이의 거리들의 표준편차가, 하나의 마이크로 렌즈를 선택해 상기 선택한 마이크로렌즈의 증심점에서 인접하는 마이크로렌즈들 사이 평균 피치 (P)의 2~ 20%인 마이크로 렌즈 어레이 시트. A base portion and a plurality of micro lenses formed on one surface of the base portion, wherein the plurality of micro lenses have an irregular arrangement, and the standard deviation of distances between the center points of two micro lenses adjacent to each other is one micro Micro lens array sheet, wherein the lens is selected and is 2-20% of the average pitch (P) between adjacent microlenses at the center of gravity of the selected microlens.
【청구항 2】 [Claim 2]
제 1항에 있어서， The method of claim 1,
상기 서로 인접하는 2개의 마이크로 렌즈의 중심점 사이의 거리들의 평균값 (평균 피치， P)이 10~ 500mi인 마이크로 렌즈 어레이 시트. And a mean value (average pitch, P) of the distances between the center points of the two micro lenses adjacent to each other.
【청구항 3】 [Claim 3]
제 1항에 있어서, The method of claim 1,
상기 복수의 마이크로 렌즈는 서로 인접하는 3개의 마이크로 렌즈의 중심점을 연결하여 형성되는 삼각형을 기본 배열 단위로 하며， 기본 배열 단위의 면적 변동율이 2~ 20%인 마이크로 렌즈 어레이 시트. The microlens array sheet is a microlens array sheet having a triangle formed by connecting center points of three adjacent microlenses to each other as a basic array unit, and an area variation rate of the basic array unit is 2 to 20%.
【청구항 4】 [Claim 4]
제 3항에 있어서 전체 기본 배열 단위의 50% 미만의 기본 배열 단위가 정삼각형인 마이크로 렌즈 어레이 시트. The method of claim 3 Microlens array sheets with less than 50% of the base array units equilateral triangles.
[청구항 5】 [Claim 5]
제 4항에 있어서, The method of claim 4, wherein
상기 배열 단위는 하기 식 (1)을 만족하는 마이크로 렌즈 어레이 시트: The array unit is a micro lens array sheet satisfying the following formula (1):
0.8 P < LI, L2, L3< 1.2X P 식 (1) 0.8 P <LI, L2, L3 <1.2X P Equation (1)
상기 식에서， LI, L2 및 L3는 상기 배열 단위의 각 변의 길이이고， P는 마이크로 렌즈사이의 평균 피치이다. In the above formula, LI, L2 and L3 are the length of each side of the array unit, and P is the average pitch between micro lenses.
【청구항 6】 [Claim 6]
제 4항에 있어서， The method of claim 4,
상기 배열 단위는 하기 식 (2)를 만족하는 마이크로 렌즈 어레이 시트: The array unit is a micro lens array sheet satisfying the following formula (2):
48° <Θ1, Θ2, Θ3 < 72° 식 (2) 48 ° <Θ1, Θ2, Θ3 <72 ° Equation (2)
상기 식에서， θΐ, Θ2 및 Θ3는 상기 배열 단위의 각 내각의 각도이다. . In the above formula, θΐ, Θ2 and Θ3 are angles of the respective internal angles of the array unit. .
【청구항 7】 [Claim 7]
제 4항에 있어서, The method of claim 4 , wherein
상기 배열 단위는 하기 식 (1) 및 식 (2)를 만족하는 마이크로 렌즈 어레이 시트: 0.8 X Ρ < LI, L2, L3< 1.2 X P 식 (1) The array unit is a microlens array sheet satisfying the following formulas (1) and (2): 0.8 X Ρ <LI, L2, L3 <1.2 X P (1)
48° <Θ1, Θ2, Θ3 < 72° 식 (2) 상기 식에서， LI, L2 및 L3는 상기 배열 단위의 각 변의 길이이고， P는 마이크로 렌즈 사이의 평균 피치이며， Θ1, Θ2 및 Θ3 는 상기 배열 단위의 각 내각의 각도이다. 48 ° <Θ1, Θ2, Θ3 <72 ° Equation (2) In the above formula, LI, L2 and L3 are the length of each side of the array unit, P is the average pitch between the micro lenses, and Θ1, Θ2 and Θ3 are angles of each interior angle of the array unit.
[청구항 8] [Claim 8]
제 4항에 있어서, The method of claim 4 , wherein
상기 마이크로 렌즈의 형상은 반구， 원뿔, 코닉 (conic) 및 타원으로 이루어진 그톱으로부터 선택되는 마이크로 렌즈 어레이 시트. The microlens array sheet is selected from the shape consisting of a hemisphere, a cone, a conic and an ellipse.
【청구항 9】 [Claim 9]
제 4항에 있어서， The method of claim 4,
상기 마이크로 렌즈의 평균 직경은 평균 피치의 90 % 내지 126 %인 마이크로 렌즈 어레이 시트. And an average diameter of the micro lenses is 90% to 126% of the average pitch.
【청구항 10】 [Claim 10]
제 4항에 있어서， The method of claim 4,
상기 마이크로 렌즈는 밑면의 직경이 동일한 원인 마이크로 렌즈 어레이 시트. The microlens array sheet causing the same diameter of the bottom of the microlens.
【청구항 11】 [Claim 11]
제 4항에 있어서， The method of claim 4,
상기 마이크로 렌즈의 높이는 평균 피치의 20 % 내지 100%인 마이크로 렌즈 어레이 시트. The height of the micro lens is a micro lens of 20% to 100% of the average pitch Array sheet.
【청구항 12] 제 1항에 있어서， 12. The method of claim 1,
상기 마이크로 렌즈는 하기의 식 (3)으로 특정되는 코닉 (conic) 렌즈인 마이크로 렌즈 어레이 시트: 식 (3)The micro lens is a micro lens array sheet which is a conic lens specified by the following formula (3): Formula (3)
Figure imgf000023_0001
상기 식어 }서 H는 코닉 렌즈의 밑면에서 가상의 정점까지의 높이이고, k는 코닉 상수, r은 코닉 렌즈 정점에서의 곡를 반경을 나타내며， 상기 코닉 상수 0 는 -3 내지 -1이다.
Figure imgf000023_0001
The formula H is the height from the bottom of the conic lens to the imaginary vertex, k is the conic constant, r is the radius of the curve at the conic lens vertex, and the conic constant 0 is -3 to -1.
【청구항 13】 [Claim 13]
제 12항에 있어서, The method of claim 12,
상기 코닉 렌즈 정점에서의 곡를 반경은 1 /m 내지 10 인 마이크로 렌즈 어레이 시 E E at a microlens array with a radius of 1 / m to 10
[청구항 14】 [Claim 14]
제 1항 내지 13항 중 어느 한 항의 마이크로 렌즈 어레이 시트를 포함하는 백라이트 유닛. A backlight unit comprising the micro lens array sheet of any one of claims 1 to 13.
PCT/KR2012/001848 2011-03-15 2012-03-14 Microlens array sheet and backlight unit having same WO2012124983A2 (en)

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JP2013558788A JP2014510952A (en) 2011-03-15 2012-03-14 Microlens array sheet and backlight unit including the same
CN201280011801.7A CN103430056B (en) 2011-03-15 2012-03-14 Microlens array sheet and comprise the back light unit of described microlens array sheet
US14/000,839 US8896925B2 (en) 2011-03-15 2012-03-14 Micro-lens array sheet and backlight unit comprising the same

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KR20110022910 2011-03-15
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KR1020120025766A KR101265312B1 (en) 2011-03-15 2012-03-13 Micro-lens array sheet and backlight unit comprising the same
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