WO2011129587A2 - Film de condensation de lumière ayant d'excellentes performances anti-adhérence et d'excellents effets de prévention du moiré, unité de rétro-éclairage le comprenant, et dispositif d'affichage comprenant l'unité de rétro-éclairage - Google Patents

Film de condensation de lumière ayant d'excellentes performances anti-adhérence et d'excellents effets de prévention du moiré, unité de rétro-éclairage le comprenant, et dispositif d'affichage comprenant l'unité de rétro-éclairage Download PDF

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Publication number
WO2011129587A2
WO2011129587A2 PCT/KR2011/002578 KR2011002578W WO2011129587A2 WO 2011129587 A2 WO2011129587 A2 WO 2011129587A2 KR 2011002578 W KR2011002578 W KR 2011002578W WO 2011129587 A2 WO2011129587 A2 WO 2011129587A2
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WO
WIPO (PCT)
Prior art keywords
lens structure
protrusion
protrusions
film
light
Prior art date
Application number
PCT/KR2011/002578
Other languages
English (en)
Korean (ko)
Other versions
WO2011129587A3 (fr
Inventor
김경모
정수희
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 KR1020110033197A external-priority patent/KR101214648B1/ko
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to CN201180015254.5A priority Critical patent/CN102933989B/zh
Priority to US13/634,807 priority patent/US9494727B2/en
Priority to JP2013504816A priority patent/JP5646728B2/ja
Publication of WO2011129587A2 publication Critical patent/WO2011129587A2/fr
Publication of WO2011129587A3 publication Critical patent/WO2011129587A3/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • 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

  • the present invention relates to a light collecting film, and a backlight unit and a display device including the same, and more particularly, to a light collecting film and a backlight and a display device including the same excellent in adhesion preventing and moiré prevention between the film.
  • a liquid crystal display injects a liquid crystal material between an upper substrate on which a common electrode and a color filter are formed, and a lower substrate on which a thin film transistor and a pixel electrode are formed.
  • a liquid crystal display injects a liquid crystal material between an upper substrate on which a common electrode and a color filter are formed, and a lower substrate on which a thin film transistor and a pixel electrode are formed.
  • the liquid crystal display is a light receiving element that does not emit light by itself
  • a backlight unit for supplying light is required.
  • the backlight unit includes a light source for supplying light, a diffusion plate or a light guide plate for converting a line light source or a point light source, and the like into a surface light source, and a plurality of optical films for improving light performance.
  • the optical film used in the backlight unit includes a condensing film that improves brightness by deflecting light in the front direction, a diffusion film that deflects defects on the back surface of the backlight, and a function of concealing the bright lines of the light source.
  • the light condensing film, the diffusion film, the protective film and the like are laminated to each other, there is a problem in that the laminated film is in close contact (blocking) causing surface defects.
  • 1 shows the wet-out phenomenon and the adhesion (blocking) phenomenon that appear when the protective film is laminated on the light collecting film.
  • a defect due to the film adhesion occurs, it is necessary to improve the quality of the display device because it is deteriorated.
  • a technique of forming protrusions at regular intervals on a peak portion of a light collecting film having a lenticular lens or a prism lens structure has been proposed.
  • the film can be prevented from adhering to each other, but there is a problem in that the moire due to the lens structure and the protrusion is severe and the image quality is degraded.
  • the irregularly formed protrusions may be partially improved such moire, it is technically very difficult to manufacture a mold formed with irregular protrusions on the lens structure.
  • a condensing film such as a lenticular lens or a prism is manufactured through a mold having an engraved surface shape, and the engraving is performed through a bite processing or the like. Therefore, in order to produce a light collecting film having irregularly arranged protrusions, it is necessary to irregularly control a frequency during bite processing, which is very difficult because mold processing is performed at a high speed rotation state.
  • the present invention is to solve the above problems, and provides a light collecting film, a backlight unit and a display device including the same that can perform film adhesion prevention and moire prevention at the same time.
  • the present invention in one aspect, includes a plurality of lens structures extending in one direction on one surface, formed on the lens structure, a plurality of protrusions arranged along the same direction as the extension direction of the lens structure
  • the first protrusion consisting of;
  • a second protrusion formed on the lens structure and including a plurality of protrusions arranged along a direction having a predetermined angle with respect to an extension direction of the lens structure.
  • the invention provides a light source; A light guide plate disposed at a side of the light source and controlling a path of light emitted from the light source; And it provides a backlight unit comprising a light collecting film of the present invention disposed on the light guide plate.
  • the invention provides a light source; A diffuser plate disposed above the light source and configured to diffuse light emitted from the light source; And it provides a backlight unit comprising a light collecting film of the present invention disposed on the diffusion plate.
  • the present invention provides a display device including the backlight unit.
  • the light collecting film of the present invention can prevent the adhesion of the film, and can prevent the occurrence of wet-out or surface defects, has an advantage of excellent moiré prevention effect, it is possible to implement excellent image quality.
  • the light collecting film of the present invention can realize a uniform product quality due to its simple manufacturing method and excellent productivity and excellent reproducibility.
  • 1 is a view showing the wet-out phenomenon and the adhesion (blocking) phenomenon when the protective film is laminated on the light collecting film.
  • FIG. 2 is a view showing an embodiment of a light collecting film of the present invention.
  • FIG. 3 is a diagram illustrating an embodiment of a backlight unit of the present invention.
  • FIG. 4 is a view showing another embodiment of the backlight unit of the present invention.
  • the present inventors have conducted research to develop a condensing film that can prevent adhesion between films without moiré, and as a result, the projections arranged in the same direction as the extending direction of the lens structure and the extending direction of the lens structure are arranged in an oblique direction.
  • the light condensing film of the present invention having the formed protrusions was developed.
  • FIG 1 shows an embodiment of the light collecting film of the present invention.
  • the light collecting film 1 of the present invention forms two projections 30 and 40 having different arrangement directions on the lens structure 20, thereby preventing moiré while effectively preventing adhesion between films. It is designed to be minimal.
  • the light condensing film of the present invention has a regular arrangement, so that it is not necessary to change the frequency during the film processing, so that the manufacturing is easy and the product reproducibility is excellent, so that the constant quality can be maintained. have.
  • the light collecting film 1 of the present invention includes a plurality of lens structures 20 extending in one direction on one surface thereof, and the first protrusions 30 having different arrangement directions on the lens structures 20. ) And the second protrusion 40.
  • the lens structure 20 is to improve the luminance of the visible range by deflecting the light emitted from the light source in a predetermined direction.
  • the lens structure 20 may be a prism lens, a lenticular lens, or a combination thereof extending in one direction.
  • the prism lens includes not only a lens having a triangular cross section, but a deformed prism in which the lens peak portion is deformed roundly.
  • the lenticular lens includes all lenses having a curved cross-sectional shape, and the cross-sectional lens may be hemispherical, hyperbolic, or parabolic.
  • the lens structure 20 is not limited thereto, but the pitch is preferably about 15 ⁇ m to 80 ⁇ m, the height is preferably 5 ⁇ m to 40 ⁇ m. If the pitch is less than 15 ⁇ m, the brightness decreases due to the increase of the valley portion of the film per unit area, and difficulty in manufacturing the mold occurs due to the limitation of the precision of the shape processing. In addition, when the pitch exceeds 100 ⁇ m, the possibility of moiré between the lens structure and the panel becomes very large. In addition, when the height of the lens structure is about 30 to 50% of the lens pitch, more specifically, when the 5 ⁇ m to 40 ⁇ m, it is possible to implement the desirable light collecting performance.
  • the first protrusion 30 and the second protrusion 40 are formed on the lens structure 20 to prevent the films from being in close contact by serving as spacers between the films.
  • the first protrusion 30 is formed of a plurality of protrusions 32 arranged along the extending direction of the lens structure
  • the second protrusion 40 is along a direction having a predetermined angle with respect to the extending direction of the lens structure. It consists of a plurality of protrusions 42 arranged.
  • the angle ⁇ between the extending direction of the lens structure and the protrusion arrangement direction of the second protrusion is preferably about 10 ° ⁇ ⁇ ⁇ 40 °, more preferably about 15 ° ⁇ ⁇ ⁇ 25 °. This is because the moiré reduction effect can be maximized when the ⁇ value is in the above range.
  • the protrusions 32 constituting the first protrusion part 30 are arranged to have a constant interval between adjacent protrusions, and more specifically, to satisfy the following equation (1). It is preferable.
  • Equation (1) P 1, x is an interval between adjacent protrusions of the first protrusion measured along the direction perpendicular to the extension direction of the lens structure, P 1, y is along the extension direction of the lens structure The distance between adjacent protrusions of the measured first protrusion, P L is the lens structure pitch, and n 1 is an integer of 1 or more.
  • n 1 is preferably about 3 to 7, more preferably about 4 to 6.
  • n 1 is 2 or less, the brightness of the light collecting film may be lowered, and when 8 or more, the adhesion performance may be significantly reduced.
  • the protrusions 42 constituting the second protrusion 40 are arranged such that the interval between neighboring protrusions is constant, and more specifically, the following equations (2) and equations It is preferable to arrange so as to satisfy (3).
  • P 2 and x are intervals between adjacent protrusions of the second protrusion measured along the direction perpendicular to the arrangement direction of the second protrusion, and P 1 and y are second.
  • the distance between adjacent protrusions of the second protrusion measured along the arrangement direction of the protrusion, P L is the lens structure pitch, n 2, y is an integer, n 2, x is n 2, the closest to y / tan ⁇ Is an integer, and ⁇ is an angle between the extension direction of the lens structure and the projection arrangement direction of the second projection.
  • the second projection is formed to satisfy the formula (4) 5 ⁇ n 2, y / sin ⁇ 18.
  • n 2, y is an integer
  • ⁇ means the angle between the extension direction of the lens structure and the projection arrangement direction of the second projection.
  • the diameter of the protrusions of the first and second protrusions is preferably about 0.1 to 0.6 times the diameter of the lens structure pitch (P L ).
  • the diameter of the projections is preferably about 5 to 30 ⁇ m, and most preferably about 12 ⁇ m. This is because when the diameter of the protrusion is less than 0.1 times the pitch of the lens structure, the adhesion preventing effect is insignificant, and when the diameter of the protrusion is more than 0.6 times, problems in formability and stability may occur.
  • the height of the protrusions of the first protrusion and the second protrusion is preferably about 0.1 to 1 times the diameter of the protrusion. If the height of the projections is less than 0.1 times the diameter of the projections, the effect of preventing adhesion is insignificant, and if it exceeds 1 times, there is a problem that molding is difficult. More specifically, the height of the projections is preferably 1 to 20 ⁇ m, preferably about 1.5 to 10 ⁇ m.
  • the light collecting film of the present invention as described above for example, the lens structure and the projection shape can be produced by injecting the curable resin into the mold engraved, and cured.
  • the shape of the lens structure may be engraved through a conventional method for forming a lens structure well known in the art, for example, mechanical cutting, photoresist reflow method, bead coating, laser etching, etc.
  • the shape of the protrusion may be engraved by a method of additionally processing the protrusion shape through a bite processing, a laser processing, or the like on a mold in which the lens structure shape is engraved.
  • the shape of the protrusion is preferably formed by laser processing.
  • laser processing is very precise, it is not only suitable for forming a fine structure such as the projection of the present invention, but also starts processing after touching the etching surface, so that even if a three-dimensional shape such as a lens structure is present on the mold surface, the depth from the curved surface may be increased. There is an advantage that can give a uniform secondary shape.
  • the optical system it is possible to adjust the etching shape, area and depth of the metal for each pulse, which enables free point processing and precisely forms protrusions at desired positions.
  • the light converging film of the present invention is not limited thereto, but for example, the first projection is first engraved in a mold in which the lens structure is engraved, and then the bite advancing direction or the laser advancing direction is changed to the second. After engraving the protrusion to form a mold, the curable resin may be injected and cured.
  • the light collecting film of the present invention manufactured by the above method is applied to the backlight unit, and exhibits an excellent adhesion preventing effect and a moiré preventing effect, and as a result, excellent image quality can be realized.
  • the light collecting film of the present invention can be used regardless of the type of backlight unit. That is, the edge type backlight having the light source positioned on the side of the display panel and the direct type backlight unit positioned on the bottom surface of the display panel may be used.
  • 3 and 4 illustrate embodiments of a backlight unit equipped with the light collecting film of the present invention.
  • the backlight unit of the present invention includes a light source 100; A light guide plate 200 disposed at a side of the light source and controlling a path of light emitted from the light source; And the light collecting film 1 of the present invention disposed on the light guide plate.
  • the backlight unit of the present invention as shown in Figure 4, the light source 100; A diffusion plate 300 disposed above the light source 100 and diffusing the light emitted from the light source; And the light collecting film 1 of the present invention disposed on the diffusion plate.
  • the backlight unit of the present invention may further include a diffusion film 400 for hiding the light source on the upper and / or lower portion of the light collecting film (1).
  • the light collecting film 1 may further include a protective film for protecting the lens structure.
  • the backlight unit of the present invention may include two or more light collecting films as necessary.
  • the backlight unit of the present invention can be usefully mounted to a display device such as a liquid crystal display device.
  • the first and second protrusions were engraved using a pulse laser, respectively.
  • the first protrusion is processed so that adjacent protrusions in the horizontal direction and the vertical direction are arranged along the extension direction of the lens structure with a spacing of 250 ⁇ m
  • the second protrusion is the alignment direction of the first protrusion (ie, the lens structure). It was processed so as to be aligned along the oblique direction inclined at 21 degrees with respect to the extension direction of ().
  • the spacing (P2, y) of the adjacent projections in the arrangement direction of the second projection portion was 418.56 ⁇ m
  • the spacing (P2, x) of the adjacent projections in the direction perpendicular to the arrangement direction was processed to be 428.46 ⁇ m.
  • a UV curable resin having a refractive index of 1.54 was added and cured to prepare a light collecting film.
  • the structure of the light collecting film prepared as above was as follows.
  • adjacent protrusions in the horizontal and vertical directions are spaced 200 ⁇ m using a pulse laser, and along the extension direction of the lens structure.
  • the protrusions were engraved to align.
  • a UV curable resin having a refractive index of 1.54 was added and cured to prepare a light collecting film.
  • the structure of the light collecting film prepared as above was as follows.
  • the cross-sectional shape of the lens structure a deformed prism having a curved surface ( curvature radius of 4 ⁇ m ) of the peak portion
  • the second projections are arranged along an oblique direction inclined by 5 ° with respect to the arrangement direction of the first projection (that is, the direction in which the lens structure extends), and the distance between adjacent projections in the arrangement direction of the second projection.
  • (P 2, y) is 573.69 ⁇ m
  • the spacing of adjacent protrusions in the direction perpendicular to the array direction (P 2, x) is condensed film in the same manner as in example 1 except that a processing such that the 551.10 ⁇ m Was prepared.
  • the second protrusions are arranged along an oblique direction inclined at 45 ° with respect to the alignment direction of the first protrusion (that is, the direction of extension of the lens structure), and the distance between adjacent protrusions in the alignment direction of the second protrusion.
  • (P 2, y) is 494.97 ⁇ m
  • the spacing of adjacent protrusions in the direction perpendicular to the array direction (P 2, x) is condensed film in the same manner as in example 1 except that a processing such that the 494.97 ⁇ m Was prepared.
  • the intervals P 2 and y of adjacent protrusions in the arrangement direction of the second protrusions are 139.52 ⁇ m, and the intervals P 2 and x of adjacent protrusions in the direction perpendicular to the alignment direction are 160.67 ⁇ m.
  • the light condensing film was manufactured by the method similar to Example 1.
  • the spacing P 2, y of adjacent protrusions in the arrangement direction of the second protrusion is 976.65 ⁇ m
  • the spacing P 2, x of adjacent protrusions in the direction perpendicular to the arrangement direction is 964.03 ⁇ m.
  • the light condensing film was manufactured by the method similar to Example 1.
  • Each of the light collecting films manufactured by Examples and Comparative Examples 1 to 7 was disposed to be orthogonal to each other on the light guide plate of the backlight unit.
  • orthogonal means that the extending directions of the lens structures of the light collecting film are arranged to be perpendicular to each other. Then, the LCD panel was put on it, and the moiré was observed by visual observation.
  • the LCD panel was used 26 inches, 32 inches and 37 inches FHD (full HD), respectively.
  • the pixels in the on state and the pixels in the off state alternately appear, such as a “white mode” and a check pattern in which all pixels are on.
  • “1 dot mod” “one-line vertical mode” in which adjacent pixel columns in the on state and pixel columns in the off state alternate, like a vertical stripe pattern.
  • 1 line vertical mode “ 1 line horizontal mode ”in which adjacent pixel rows in the on state and pixel rows in the off state appear alternately like a horizontal stripe pattern. In all four modes. The measurement results are shown in Table 1.
  • Each of the light collecting films manufactured by Examples and Comparative Examples 1 to 7 was disposed to be orthogonal to each other on the light guide plate of the backlight unit.
  • orthogonal means that the extending directions of the lens structures of the light collecting film are arranged to be perpendicular to each other.
  • luminance of the center position of the condensing film front surface was measured.
  • Topcon BM7 TM was used as the luminance measuring device, and when the luminance of the example was regarded as a reference (100%), it was represented as a relative luminance value of Comparative Examples 1-7. The measurement results are shown in Table 1.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Laminated Bodies (AREA)
  • Planar Illumination Modules (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

La présente invention porte sur un film de condensation de lumière, lequel film comprend : une pluralité de structures de lentilles s'étendant dans une direction sur une surface de celui-ci ; une première unité de saillie qui comprend une pluralité de saillies formées sur les structures de lentilles, et qui est disposée dans la même direction que la direction d'extension des structures de lentilles ; et une seconde unité de saillie qui comprend une pluralité de saillies formées sur les structures de lentilles, et qui est disposée dans une direction présentant un angle prédéterminé par rapport à la direction d'extension des structures de lentilles. La présente invention porte également sur une unité de rétro-éclairage comprenant le film, et sur un dispositif d'affichage comprenant l'unité de rétro-éclairage.
PCT/KR2011/002578 2010-04-13 2011-04-12 Film de condensation de lumière ayant d'excellentes performances anti-adhérence et d'excellents effets de prévention du moiré, unité de rétro-éclairage le comprenant, et dispositif d'affichage comprenant l'unité de rétro-éclairage WO2011129587A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201180015254.5A CN102933989B (zh) 2010-04-13 2011-04-12 聚光膜、含该聚光膜的背光元件及含该背光元件的显示器
US13/634,807 US9494727B2 (en) 2010-04-13 2011-04-12 Light-condensing film having superior anti-adhesion performance and superior moiré prevention effects, backlight unit comprising same, and display device comprising the backlight unit
JP2013504816A JP5646728B2 (ja) 2010-04-13 2011-04-12 密着防止性能及びモアレ防止効果に優れた集光フィルム、それを含むバックライトユニット、ディスプレイ装置及び集光フィルムの製造方法

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2010-0033849 2010-04-13
KR20100033849 2010-04-13
KR1020110033197A KR101214648B1 (ko) 2010-04-13 2011-04-11 밀착 방지 성능 및 모아레 방지 효과가 우수한 집광 필름, 이를 포함하는 백라이트 유닛 및 디스플레이 장치
KR10-2011-0033197 2011-04-11

Publications (2)

Publication Number Publication Date
WO2011129587A2 true WO2011129587A2 (fr) 2011-10-20
WO2011129587A3 WO2011129587A3 (fr) 2012-02-02

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100697613B1 (ko) * 2006-06-22 2007-03-22 주식회사 엘지에스 광학필름 및 이를 이용한 면광원 장치
KR100840572B1 (ko) * 2007-03-14 2008-06-23 엘지전자 주식회사 렌즈 시트, 이를 이용한 백라이트 유닛 및 액정표시장치
KR20090094777A (ko) * 2008-03-03 2009-09-08 주식회사 엘지화학 광학 필름 및 그 제조 방법

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100697613B1 (ko) * 2006-06-22 2007-03-22 주식회사 엘지에스 광학필름 및 이를 이용한 면광원 장치
KR100840572B1 (ko) * 2007-03-14 2008-06-23 엘지전자 주식회사 렌즈 시트, 이를 이용한 백라이트 유닛 및 액정표시장치
KR20090094777A (ko) * 2008-03-03 2009-09-08 주식회사 엘지화학 광학 필름 및 그 제조 방법

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