WO2005119351A1 - Optical film - Google Patents

Optical film Download PDF

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Publication number
WO2005119351A1
WO2005119351A1 PCT/KR2004/001923 KR2004001923W WO2005119351A1 WO 2005119351 A1 WO2005119351 A1 WO 2005119351A1 KR 2004001923 W KR2004001923 W KR 2004001923W WO 2005119351 A1 WO2005119351 A1 WO 2005119351A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
patterns
optical patterns
optical film
film
Prior art date
Application number
PCT/KR2004/001923
Other languages
French (fr)
Inventor
Woo-Joo Lah
Yong-Shig Shim
Original Assignee
Lgs Corporation Ltd.
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
Application filed by Lgs Corporation Ltd. filed Critical Lgs Corporation Ltd.
Publication of WO2005119351A1 publication Critical patent/WO2005119351A1/en

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Classifications

    • 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
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • 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
    • G02B3/005—Arrays characterized by the distribution or form of lenses arranged along a single direction only, e.g. lenticular sheets
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • 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
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays

Definitions

  • the present invention relates to an optical film, and more particularly, to an optical film, wherein the structure of optical patterns for collecting and refracting light is improved.
  • a backlight unit 100 provided in a display device such as a TFT-LCD monitor or an LCD for a mobile phone includes an optical film 101 for allowing an image to be displayed on a panel 107 by collecting and refracting light emitted from a light source 105 and by causing the refracted light to be incident on the panel 107, as shown in Fig. 12.
  • the conventional optical film 101 for collecting and refracting light in the backlight unit has a structure in which a plurality of prism patterns 111 with a triangular cross section are arranged linearly, as shown in Fig. 11.
  • an object of the present invention is to provide an optical film capable of exhibiting high brightness at a wide viewing angle, preventing a wet-out phenomenon, and improving productivity.
  • an optical film comprising a first refraction portion having a plurality of first optical patterns that have optical sections for controlling light and are arranged linearly at a predetermined interval; and a second refraction portion having a plurality of second optical patterns that have optical sections and are arranged linearly at a predetermined interval and formed along pattern surfaces of the first optical patterns in a direction intersecting a longitudinal direction of the first optical patterns.
  • each of the optical patterns has a polygonal or arcuate shape, or a complex form including polygonal and arcuate shapes, and the optical patterns of the first and second optical patterns are identical with or different from each other.
  • Each of the optical patterns of the first and second optical patterns may take an upwardly protruding, convex shape or a downwardly depressed, concave shape.
  • An intersection angle between the first and second optical patterns may be in a range of 0 to 180 degrees.
  • the first and second refraction portions may be formed integrally with each other, or formed separately from each other and then coupled to be in contact with each other by using any one of polycarbonate, PVC, PP, PE and acrylic polymers, or the first and second refraction portions may be formed separately from each other and then coupled to be in contact with each other by using different respective materials among the materials. Further, the first and second optical patterns may be formed at a regular interval or irregular intervals.
  • the present invention provides an optical film in which a plurality of second optical patterns are linearly arranged along pattern surfaces of first optical patterns that are in the form of embossments and have optical sections for controlling light, thereby achieving high brightness at a wide viewing angle, avoiding the wet-out phenomenon to eliminate moire, and improving productivity.
  • Fig. 1 is a perspective view of an optical film according to a first embodiment of the present invention.
  • Fig. 2 is a sectional view of the optical film shown in Fig. 1.
  • Fig. 3 is a perspective view of an optical film according to a second embodiment of the present invention.
  • Fig. 4 is a sectional view of the optical film shown in Fig. 3.
  • Fig. 5 is a perspective view of an optical film according to a third embodiment of the present invention.
  • Fig. 6 is a sectional view of the optical film shown in Fig. 5.
  • Fig. 7 is a perspective view of an optical film according to a fourth embodiment of the present invention.
  • Fig. 8 is a perspective view of an optical film according to a fifth embodiment of the present invention.
  • Fig. 1 is a perspective view of an optical film according to a first embodiment of the present invention.
  • Fig. 2 is a sectional view of the optical film shown in Fig. 1.
  • Fig. 3 is a perspective view of
  • FIG. 9 is a perspective view of an optical film according to a sixth embodiment of the present invention.
  • Fig. 10 is a view showing the structure of a general backlight unit in which an optical film is installed.
  • Fig. 11 is a perspective view of a conventional optical film.
  • Fig. 12 is a perspective view of another conventional optical film.
  • Fig. 1 is a perspective view of an optical film according to a first embodiment of the present invention
  • Fig. 2 is a sectional view of the optical film shown in Fig. 1.
  • the optical film 1 of this embodiment comprises a first refraction portion 10 with first optical patterns 11 for collecting light, which has been emitted from a light source 105 and is incident thereon; and a second refraction portion 20 with second optical patterns 21 for nearly vertically refracting the light collected by the first refraction portion 10 and delivering the refracted light to a panel 107.
  • the plurality of first optical patterns 11 of the first refraction portion 10 are linearly arranged at a predetermined interval when viewed in a plan view thereof. When viewed in a sectional view thereof, each of the first optical patterns has an optical section that takes an upwardly protruding, arcuate shape.
  • the first optical patterns 11 collect and refract the light delivered from the light source 105 by means of pattern surfaces thereof formed as arcuate surfaces and then deliver the collected and refracted light to the second optical patterns 21, as designated by arrows in the figures.
  • the control of the collection and refraction of the light by the first optical patterns 11 can be achieved by adjusting the sizes, structures and intervals of the first optical patterns 11 upon manufacture of the optical film 1.
  • Each of the second optical patterns 21 of the second refraction portion 20 has a triangular optical section when viewed in a sectional view, and they are linearly arranged at a predetermined interval in a direction intersecting the longitudinal direction of the first optical patterns 11 when viewed in a plan view.
  • the second optical patterns 21 are formed along the pattern surfaces of the first optical patterns 11 in a state where the second optical patterns are in contact with an upper surface of the first refraction portion 10. Accordingly, the second optical patterns 21 take a corrugated shape as a whole while being in contact with the pattern surfaces of the first optical patterns 11. Such a structure allows one to hardly observe the wet-out phenomenon with the naked eye by minimizing optical coupling of the first and second optical patterns 11 and 21 with each other. Further, since the second optical patterns 21 are arranged to intersect the first optical patterns 11, the refraction direction of the light emitted from the light source 105 is expanded at the first and second optical patterns 11 and 21.
  • first and second refraction portions 10 and 20 be formed as a single layer by using any one of polycarbonate, PVC, PP, PE and acrylic polymers which are light-transmitting materials through which light in the visible range can be smoothly transmitted.
  • the first and second refraction portions 10 and 20 may be manufactured to define a multi-layered structure by separately forming them out of an identical material or different respective materials among the aforementioned materials and coupling them to be in contact with each other.
  • the optical film 1 of the present invention may comprise first optical patterns 11 each of which has a downwardly depressed, arcuate optical section and second optical patterns 21 each of which has a triangular optical section and which are linearly arranged at a predetermined interval to be corrugated along the depressed pattern surfaces of the first optical patterns 11 in a direction intersecting the longitudinal direction of the first optical patterns 11 when viewed in a plan view, as shown in Figs. 3 and 4.
  • first optical patterns 11 each of which has a downwardly depressed, arcuate optical section
  • second optical patterns 21 each of which has a triangular optical section and which are linearly arranged at a predetermined interval to be corrugated along the depressed pattern surfaces of the first optical patterns 11 in a direction intersecting the longitudinal direction of the first optical patterns 11 when viewed in
  • the optical film 1 of the present invention may comprise first and second optical patterns 11 and 21 both of which are formed to have triangular optical sections, and the second optical patterns 21 may then be formed to be corrugated along pattern surfaces of the first optical patterns 11 in a direction of the longitudinal direction of the first optical patterns 11.
  • the optical film 1 of the present invention may comprise first and second optical patterns 11 and 21 both of which are formed to have arcuate optical sections and the second optical patterns 21 may then be formed to be wavy along pattern surfaces of the first optical patterns 11 in a direction of the longitudinal direction of the first optical patterns 11.
  • the optical film 1 of the present invention may comprise first optical patterns 11 with optical sections formed at irregular intervals, and second optical patterns 21 with optical sections formed at a regular interval in a direction intersecting the longitudinal direction of the first optical patterns 11. It will also be apparent that the optical patterns of at least one or both of the first and second optical patterns 11 and 21 may be formed at irregular intervals.
  • the optical film 1 of the present invention constructed as above increases brightness over the entire area of the panel 107 in such a manner the light emitted by the light source 105 is collected by the pattern surfaces of the first optical patterns 11 and then refracted toward the second refraction portion 20 according to the angles of the pattern surfaces, and the refracted light is refracted by the second optical patterns 21 nearly vertically in a direction intersecting the refraction direction of the first optical patterns 11 and then incident on the panel 107. Therefore, it is possible to achieve high brightness even at a wide viewing angle. Since the second optical patterns 21 are formed along the pattern surfaces of the first optical patterns 11 and thus have the structure including the corrugated peaks, it is possible to minimize the optical coupling with other adjacent films.
  • the wet-out phenomenon cannot be observed with the naked eye and thus moire does not occur. Further, even though there is a mote or scratch on the optical film 1, it cannot be visually observed due to the scattering of the light at the corrugated pattern surfaces of the first and second optical patterns 11 and 21. Therefore, the productivity of the optical film 1 is improved due to a reduced percent defective and improved workability.
  • an optical film in which high brightness can be achieved at a wide viewing angle, the wet-out phenomenon can be avoided, and productivity can be improved.

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

Abstract

The present invention relates to an optical film. The optical film comprises a first refraction portion having a plurality of first optical patterns that have optical sections for controlling light and are arranged linearly at a predetermined interval; and a second refraction portion having a plurality of second optical patterns that have optical sections and are arranged linearly at a predetermined interval and formed along pattern surfaces of the first optical patterns in a direction intersecting a longitudinal direction of the first optical patterns. Accordingly, there is provided an optical film in which high brightness can be achieved at a wide viewing angle, the wet-out phenomenon can be avoided, and productivity can be improved.

Description

OPTICAL FILM
TECHNICAL FIELD The present invention relates to an optical film, and more particularly, to an optical film, wherein the structure of optical patterns for collecting and refracting light is improved.
BACKGROUND ART A backlight unit 100 provided in a display device such as a TFT-LCD monitor or an LCD for a mobile phone includes an optical film 101 for allowing an image to be displayed on a panel 107 by collecting and refracting light emitted from a light source 105 and by causing the refracted light to be incident on the panel 107, as shown in Fig. 12. The conventional optical film 101 for collecting and refracting light in the backlight unit has a structure in which a plurality of prism patterns 111 with a triangular cross section are arranged linearly, as shown in Fig. 11. Since such a conventional optical film 101 with the prism patterns 111 has a limitation on a direction in which light is collected and refracted, there is a disadvantage in that brightness is remarkably lowered as a viewing angle for the panel 107 increases. To overcome such a disadvantage, there has been disclosed a technique in which two sheets of optical films 201a and 201b having prism patterns 211a and 211b with triangular cross sections are prepared and then installed such that their prism patterns 211a and 211b intersect each other, as shown in Fig. 12. In the prior art in which the two sheets of optical films 201 and 201b are installed such that their prism patterns 211a and 211b intersect each other, a direction in which light is collected and refracted is expanded and thus it is possible to prevent deterioration of brightness to a certain extent even though the viewing angle for the panel 107 increases.
However, there is a wet-out phenomenon due to optical coupling of uppermost ends of the prism patterns 211a of the lower optical film 201 of the both optical films 201a and 201b in the figure with the upper optical film 201b and adjacent other films. This causes a critical problem in that moire is produced in an image displayed on the panel 107. Further, in the prior art in which the two sheets of optical films 201 and 201b are installed such that their prism patterns 211a and 211b intersect each other, even though the direction in which light is collected and refracted is expanded, there is still a limitation on the light-refracting direction due to the structure of the triangular prism patterns 211a and 211b. Thus, there is a problem in that it is not possible to expect remarkable improvement of brightness. Moreover, in the prior art in which the two sheets of optical films 201 and 201b are installed such that their prism patterns 211a and 211b intersect each other, it is not possible to expect light-scattering effects, due to the limited light-refracting direction. Thus, there is a disadvantage in that, even though a mote or scratch is produced between the both optical films 201a and 201b during a manufacturing process, this cannot be visually removed. Accordingly, there is a problem in that productivity is lowered due to an increased percent defective and working difficulty.
DISCLOSURE
TECHNICAL PROBLEM Accordingly, an object of the present invention is to provide an optical film capable of exhibiting high brightness at a wide viewing angle, preventing a wet-out phenomenon, and improving productivity.
TECHNICAL SOLUTION According to the present invention for achieving the object, there is provided an optical film, comprising a first refraction portion having a plurality of first optical patterns that have optical sections for controlling light and are arranged linearly at a predetermined interval; and a second refraction portion having a plurality of second optical patterns that have optical sections and are arranged linearly at a predetermined interval and formed along pattern surfaces of the first optical patterns in a direction intersecting a longitudinal direction of the first optical patterns. Preferably, each of the optical patterns has a polygonal or arcuate shape, or a complex form including polygonal and arcuate shapes, and the optical patterns of the first and second optical patterns are identical with or different from each other. Each of the optical patterns of the first and second optical patterns may take an upwardly protruding, convex shape or a downwardly depressed, concave shape. An intersection angle between the first and second optical patterns may be in a range of 0 to 180 degrees. The first and second refraction portions may be formed integrally with each other, or formed separately from each other and then coupled to be in contact with each other by using any one of polycarbonate, PVC, PP, PE and acrylic polymers, or the first and second refraction portions may be formed separately from each other and then coupled to be in contact with each other by using different respective materials among the materials. Further, the first and second optical patterns may be formed at a regular interval or irregular intervals.
ADVANTAGEOUS EFFECTS The present invention provides an optical film in which a plurality of second optical patterns are linearly arranged along pattern surfaces of first optical patterns that are in the form of embossments and have optical sections for controlling light, thereby achieving high brightness at a wide viewing angle, avoiding the wet-out phenomenon to eliminate moire, and improving productivity.
DESCRIPTION DRAWINGS Fig. 1 is a perspective view of an optical film according to a first embodiment of the present invention. Fig. 2 is a sectional view of the optical film shown in Fig. 1. Fig. 3 is a perspective view of an optical film according to a second embodiment of the present invention. Fig. 4 is a sectional view of the optical film shown in Fig. 3. Fig. 5 is a perspective view of an optical film according to a third embodiment of the present invention. Fig. 6 is a sectional view of the optical film shown in Fig. 5. Fig. 7 is a perspective view of an optical film according to a fourth embodiment of the present invention. Fig. 8 is a perspective view of an optical film according to a fifth embodiment of the present invention. Fig. 9 is a perspective view of an optical film according to a sixth embodiment of the present invention. Fig. 10 is a view showing the structure of a general backlight unit in which an optical film is installed. Fig. 11 is a perspective view of a conventional optical film. Fig. 12 is a perspective view of another conventional optical film.
MODE FOR INVENTION Hereinafter, the present invention will be described in detail with reference to accompanying drawings. It should be noted that for the sake of convenience of description, optical films shown in the drawings are exaggerated. Fig. 1 is a perspective view of an optical film according to a first embodiment of the present invention, and Fig. 2 is a sectional view of the optical film shown in Fig. 1. As shown in the figures, the optical film 1 of this embodiment comprises a first refraction portion 10 with first optical patterns 11 for collecting light, which has been emitted from a light source 105 and is incident thereon; and a second refraction portion 20 with second optical patterns 21 for nearly vertically refracting the light collected by the first refraction portion 10 and delivering the refracted light to a panel 107. As shown in Figs. 1 and 2, the plurality of first optical patterns 11 of the first refraction portion 10 are linearly arranged at a predetermined interval when viewed in a plan view thereof. When viewed in a sectional view thereof, each of the first optical patterns has an optical section that takes an upwardly protruding, arcuate shape. The first optical patterns 11 collect and refract the light delivered from the light source 105 by means of pattern surfaces thereof formed as arcuate surfaces and then deliver the collected and refracted light to the second optical patterns 21, as designated by arrows in the figures. At this time, the control of the collection and refraction of the light by the first optical patterns 11 can be achieved by adjusting the sizes, structures and intervals of the first optical patterns 11 upon manufacture of the optical film 1. Each of the second optical patterns 21 of the second refraction portion 20 has a triangular optical section when viewed in a sectional view, and they are linearly arranged at a predetermined interval in a direction intersecting the longitudinal direction of the first optical patterns 11 when viewed in a plan view. At this time, the second optical patterns 21 are formed along the pattern surfaces of the first optical patterns 11 in a state where the second optical patterns are in contact with an upper surface of the first refraction portion 10. Accordingly, the second optical patterns 21 take a corrugated shape as a whole while being in contact with the pattern surfaces of the first optical patterns 11. Such a structure allows one to hardly observe the wet-out phenomenon with the naked eye by minimizing optical coupling of the first and second optical patterns 11 and 21 with each other. Further, since the second optical patterns 21 are arranged to intersect the first optical patterns 11, the refraction direction of the light emitted from the light source 105 is expanded at the first and second optical patterns 11 and 21. Particularly, since the refraction direction of the light is more expanded due to the corrugated surfaces and optical sections of the second optical patterns 21 along the pattern surfaces of the first refraction patterns, high brightness performance can be achieved at a wider area. At this time, an intersection angle between the first and second optical patterns 11 and 21 can be adjusted within a range of 0 to 180 degrees, if necessary. It is preferred herein that the first and second refraction portions 10 and 20 be formed as a single layer by using any one of polycarbonate, PVC, PP, PE and acrylic polymers which are light-transmitting materials through which light in the visible range can be smoothly transmitted. Alternatively, if necessary, the first and second refraction portions 10 and 20 may be manufactured to define a multi-layered structure by separately forming them out of an identical material or different respective materials among the aforementioned materials and coupling them to be in contact with each other. Meanwhile, the optical film 1 of the present invention may comprise first optical patterns 11 each of which has a downwardly depressed, arcuate optical section and second optical patterns 21 each of which has a triangular optical section and which are linearly arranged at a predetermined interval to be corrugated along the depressed pattern surfaces of the first optical patterns 11 in a direction intersecting the longitudinal direction of the first optical patterns 11 when viewed in a plan view, as shown in Figs. 3 and 4. Alternatively, as shown in Figs. 5 and 6, the optical film 1 of the present invention may comprise first and second optical patterns 11 and 21 both of which are formed to have triangular optical sections, and the second optical patterns 21 may then be formed to be corrugated along pattern surfaces of the first optical patterns 11 in a direction of the longitudinal direction of the first optical patterns 11. Further, as shown in Figs. 7 and 8, the optical film 1 of the present invention may comprise first and second optical patterns 11 and 21 both of which are formed to have arcuate optical sections and the second optical patterns 21 may then be formed to be wavy along pattern surfaces of the first optical patterns 11 in a direction of the longitudinal direction of the first optical patterns 11. Moreover, as shown in Fig. 9, the optical film 1 of the present invention may comprise first optical patterns 11 with optical sections formed at irregular intervals, and second optical patterns 21 with optical sections formed at a regular interval in a direction intersecting the longitudinal direction of the first optical patterns 11. It will also be apparent that the optical patterns of at least one or both of the first and second optical patterns 11 and 21 may be formed at irregular intervals. The optical film 1 of the present invention constructed as above increases brightness over the entire area of the panel 107 in such a manner the light emitted by the light source 105 is collected by the pattern surfaces of the first optical patterns 11 and then refracted toward the second refraction portion 20 according to the angles of the pattern surfaces, and the refracted light is refracted by the second optical patterns 21 nearly vertically in a direction intersecting the refraction direction of the first optical patterns 11 and then incident on the panel 107. Therefore, it is possible to achieve high brightness even at a wide viewing angle. Since the second optical patterns 21 are formed along the pattern surfaces of the first optical patterns 11 and thus have the structure including the corrugated peaks, it is possible to minimize the optical coupling with other adjacent films. Accordingly, the wet-out phenomenon cannot be observed with the naked eye and thus moire does not occur. Further, even though there is a mote or scratch on the optical film 1, it cannot be visually observed due to the scattering of the light at the corrugated pattern surfaces of the first and second optical patterns 11 and 21. Therefore, the productivity of the optical film 1 is improved due to a reduced percent defective and improved workability.
INDUSTRIAL APPLICABILITY According to the present invention, there is provided an optical film in which high brightness can be achieved at a wide viewing angle, the wet-out phenomenon can be avoided, and productivity can be improved.

Claims

1. An optical film, comprising: a first refraction portion having a plurality of first optical patterns with optical sections for controlling light, the first optical patterns being arranged linearly at a predetermined interval; and a second refraction portion having a plurality of second optical patterns with optical sections, the second optical patterns being arranged linearly at a predetermined interval and formed along pattern surfaces of the first optical patterns in a direction intersecting a longitudinal direction of the first optical patterns.
2. The optical film as claimed in claim 1, wherein each of the optical patterns has a polygonal or arcuate shape, or a complex form including polygonal and arcuate shapes, and the optical patterns of the first and second optical patterns are identical with or different from each other.
3. The optical film as claimed in claim 1 or 2, wherein each of the optical patterns of the first and second optical patterns takes an upwardly protruding, convex shape or a downwardly depressed, concave shape.
4. The optical film as claimed in claim 1 or 2, wherein an intersection angle between the first and second optical patterns is in a range of 0 to 180 degrees.
5. The optical film as claimed in claim 1, wherein the first and second refraction portions are formed integrally with each other, or formed separately from each other and then coupled to be in contact with each other by using any one of polycarbonate, PVC, PP, PE and acrylic polymers, or the first and second refraction portions are formed separately from each other and then coupled to be in contact with each other by using different respective materials among the materials.
6. The optical film as claimed in claim 1, wherein the first and second optical patterns are formed at a regular interval or irregular intervals.
PCT/KR2004/001923 2004-06-04 2004-07-30 Optical film WO2005119351A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020040040878A KR100553155B1 (en) 2004-06-04 2004-06-04 Optical film
KR10-2004-0040878 2004-06-04

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Cited By (4)

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EP1933178A1 (en) * 2006-12-12 2008-06-18 Samsung Electronics Co., Ltd. Optical sheet and method for fabricating the same
EP2120070A1 (en) * 2008-05-16 2009-11-18 LG Electronics Inc. Optical sheet, backlight unit, and liquid crystal display
US9810817B2 (en) 2008-04-02 2017-11-07 3M Innovative Properties Company Light directing film and method for making the same
US10767837B2 (en) 2013-11-15 2020-09-08 Lg Innotek Co., Ltd. Optical member and lighting device using the same

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KR101279961B1 (en) * 2007-10-31 2013-07-05 제일모직주식회사 Prism sheet having lengthwise wave patterned prisms and convex diffusers, back light unit having the prism sheet and liquid crystal display device having the back light unit
KR101020619B1 (en) * 2009-03-17 2011-03-09 주식회사 코아옵틱스 Optical film and master roll for making pattern and making method of pattern for master roll

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Publication number Priority date Publication date Assignee Title
JPH07114025A (en) * 1993-10-20 1995-05-02 Sharp Corp Liquid crystal display device
KR20010106393A (en) * 2001-11-12 2001-11-29 윤효철 Backlight unit
WO2002004858A2 (en) * 2000-07-11 2002-01-17 3M Innovative Properties Company Backlight with structured sufaces

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07114025A (en) * 1993-10-20 1995-05-02 Sharp Corp Liquid crystal display device
WO2002004858A2 (en) * 2000-07-11 2002-01-17 3M Innovative Properties Company Backlight with structured sufaces
KR20010106393A (en) * 2001-11-12 2001-11-29 윤효철 Backlight unit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1933178A1 (en) * 2006-12-12 2008-06-18 Samsung Electronics Co., Ltd. Optical sheet and method for fabricating the same
US8158040B2 (en) 2006-12-12 2012-04-17 Samsung Electronics Co., Ltd. Method for fabricating an optical sheet
US9810817B2 (en) 2008-04-02 2017-11-07 3M Innovative Properties Company Light directing film and method for making the same
US10197713B2 (en) 2008-04-02 2019-02-05 3M Innovative Properties Company Light directing film and method for making the same
EP2120070A1 (en) * 2008-05-16 2009-11-18 LG Electronics Inc. Optical sheet, backlight unit, and liquid crystal display
US8023068B2 (en) 2008-05-16 2011-09-20 Lg Electronics Inc. Optical sheet, backlight unit, and liquid crystal display
US10767837B2 (en) 2013-11-15 2020-09-08 Lg Innotek Co., Ltd. Optical member and lighting device using the same

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KR100553155B1 (en) 2006-02-22

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