WO2023132545A1 - Plaque de guidage de lumière ayant une visibilité extérieure améliorée à l'aide d'un motif complexe et dispositif d'affichage la comprenant - Google Patents

Plaque de guidage de lumière ayant une visibilité extérieure améliorée à l'aide d'un motif complexe et dispositif d'affichage la comprenant Download PDF

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Publication number
WO2023132545A1
WO2023132545A1 PCT/KR2022/021303 KR2022021303W WO2023132545A1 WO 2023132545 A1 WO2023132545 A1 WO 2023132545A1 KR 2022021303 W KR2022021303 W KR 2022021303W WO 2023132545 A1 WO2023132545 A1 WO 2023132545A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
dot
light source
light guide
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PCT/KR2022/021303
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English (en)
Korean (ko)
Inventor
류충엽
최호범
유래완
이승근
송현근
이경태
Original Assignee
주식회사 에이치비테크놀러지
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Publication of WO2023132545A1 publication Critical patent/WO2023132545A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • 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
    • 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
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides

Definitions

  • the present invention relates to a light guide plate with improved external visibility with a complex pattern and a display device including the same, and relates to a technique for minimizing the visibility of defects in the light guide plate and improving appearance problems caused by the design of an LED light source.
  • a liquid crystal display is one of the most widely used flat panel displays (FPD), and consists of two substrates on which electrodes are formed and a liquid crystal layer inserted therebetween. It is a device that displays an image by adjusting the amount of transmitted light by rearranging the liquid crystal molecules of the liquid crystal layer by applying a .
  • a display such as a liquid crystal display (LCD) uses a two-dimensional light source that transmits light emitted from a one-dimensional light source to a light guide plate and then transmits through one surface thereof.
  • the efficiency of the surface light source is the overall efficiency of the display device. It is emerging as an important factor in determining performance.
  • the efficiency of light in a conventional liquid crystal display (LCD) is about 3 to 10%, and light loss mainly occurs in a light guide plate, a polarizer, and a color filter.
  • diffusion sheets, prism sheets, and dual brightness enhancement film (DBEF) sheets installed on the light guide plate tend to be integrated or detached, and accordingly, the visibility of defects in the light guide plate is gradually increasing.
  • DBEF dual brightness enhancement film
  • the size of the pattern is formed very finely in preparation for defects, and the vulnerability of the light guide plate to defects has increased.
  • the visibility of such excessive defects may increase the defect rate of the light guide plate, reduce the efficiency of the assembly process, and deteriorate the image quality of the display.
  • a conventional backlight device may include a light guide plate, a reflective sheet installed under the light guide plate, a QD sheet installed above the light guide plate, a diffusion sheet, a prism sheet, a DBED sheet, and a light source installed on one side of the light guide plate.
  • the light guide plate After the light emitted from the external light source is incident on the light guide plate, a part of it is emitted to the outside of the light guide plate by the pattern, but some defects play a role similar to the pattern and are likewise emitted to the outside.
  • some of the light emitted by the defect is emitted as light having a higher intensity than the pattern formed on the light guide plate, and thus an uneven portion of light may be visually recognized in a backlight requiring an overall uniform surface light source.
  • Patent Document 1 Republic of Korea Patent Registration No. 10-1872348 (2018.06.29)
  • the present invention is a complex pattern that can minimize defects caused by foreign matter and visibility due to deformation of workability through a dot pattern and a dot group formed on a light guide plate and improve appearance problems caused by the design structure of an LED device.
  • a light guide plate having improved visibility and a display device including the light guide plate may be provided.
  • a light guide plate having improved external visibility includes a plurality of dot patterns for dispersing light sources on a surface opposite to a light exit surface from which light sources are emitted, and a plurality of dot groups by densely clustering the dot patterns in a predetermined number.
  • the dot group is provided after the light intersection point where the propagation area in which the light source generated from each light source unit propagates crosses each other based on the light incident surface on which the light source is incident, and the dot pattern is provided before the light intersection point
  • the density of the non-propagation area between the propagation area and each light source unit excluded from the propagation area may be different.
  • the dot groups may be arranged in any one of a precise arrangement formed at equal intervals and a random arrangement formed at random intervals based on the light incident surface.
  • the dot groups may be randomly arranged with mutual intervals in one direction.
  • the dot groups may be provided in a zigzag pattern with respect to each one direction.
  • the dot groups may have a distribution density that is changed for each location in one direction.
  • the dot groups may be provided with the number of dot patterns changed for each position.
  • the non-propagation area may be denser than the propagation area.
  • the dot patterns may be provided in any one of a precise arrangement formed at equal intervals in one direction with respect to the light incident surface and a random arrangement formed at random intervals.
  • the dot pattern may be changed so that the density of the light incident surface to the light crossing point is gradually increased or decreased with respect to the non-propagating region.
  • the light crossing point may be a point where the amount of light increases due to crossed light sources.
  • it may be a display device including the light guide plate.
  • the present invention it is possible to provide a uniformly high-quality appearance to a liquid crystal screen by improving the irregular light viewing phenomenon that occurs according to the design structure of the LED device, it is possible to improve the display quality during mass production, and by optimizing the light source design structure Manufacturing cost can be saved.
  • FIG. 1 is a configuration diagram of a light guide plate having improved external visibility according to an exemplary embodiment.
  • FIG. 2 is a cross-sectional view of a light guide plate to which a mold and a general dot group are applied according to an exemplary embodiment.
  • FIG. 3 is a diagram illustrating a light guide plate to which an actual mold and a general dot group are applied according to an exemplary embodiment.
  • FIG. 4 is a cross-sectional view illustrating light dispersion of a light guide plate to which a general dot group is applied according to an exemplary embodiment.
  • FIG. 5 is a cross-sectional view illustrating light dispersion of a light guide plate to which a general dot group and a mold are applied according to an exemplary embodiment.
  • FIG. 6 is a cross-sectional view illustrating a light guide plate in which dot patterns of a light source in a propagation area and a non-propagation area are applied in a random arrangement according to an exemplary embodiment.
  • FIG. 7 is a cross-sectional view illustrating a light guide plate in which dot patterns of a propagation area and a non-propagation area of a light source are applied in a precise arrangement according to an exemplary embodiment.
  • FIG. 8 is a cross-sectional view illustrating light dispersion of a light guide plate having improved external visibility according to an exemplary embodiment.
  • FIG. 9 is a cross-sectional view illustrating light dispersion of a light guide plate having improved external visibility to which a mold is applied according to an exemplary embodiment.
  • FIG. 1 is a configuration diagram of a light guide plate having improved external visibility according to an exemplary embodiment.
  • the configuration of the light guide plate 100 with improved external visibility includes a plurality of dot patterns 10 distributing light sources on a surface opposite to a light exit surface from which light sources are emitted, and the dot patterns
  • a plurality of dot groups 20 are provided by concentrating a predetermined number of dot groups 20, and the dot groups 20 are propagation areas in which light sources generated from at least one light source propagate based on the light incident surface on which the light sources are incident. 50 is provided after the light crossing point 1 where they intersect each other, and the dot pattern 10 is provided before the light crossing point 1, and the propagation area 50 and the propagation area 50 Density of the non-propagation area 40 between each light source unit 30 excluded from may be provided differently.
  • the dot groups 20 may be provided in any one of a precise arrangement formed at equal intervals and a random arrangement formed at random intervals based on the light incident surface.
  • the dot groups 20 may be randomly arranged with mutual intervals in one direction, and the dot groups 20 may be provided in a zigzag pattern in each one direction.
  • the dot groups 20 may be provided with the number of the dot patterns 10 changed for each position.
  • the non-propagation area 40 may be denser than the propagation area 50, and the dot pattern 10 is a precise arrangement formed at equal intervals in one direction with respect to the light incident surface, and It may be provided in any one of random arrays formed at random intervals.
  • the dot pattern 10 may be changed so that the density of the non-propagating region 40 from the light incident surface to the light crossing point 1 is gradually increased or decreased.
  • the light intersection point 1 may be a point where the amount of light increases due to the crossed light sources.
  • a display device including the light guide plate 100 including the features described above may be included.
  • the distance between each dot group 20 becomes farther as it is closer to the light source, and the distance between each dot group 20 may become narrower as the distance from the light source increases.
  • the distance between each dot group 20 increases as it is closer to the light source, and the distance between each dot group 20 decreases as the distance from the light source increases.
  • the dot group 20 may be arranged at a predetermined angle so as to secure an optical path based on the surface on which the light source is incident, with the arrangement of the plurality of dot patterns 10 .
  • the dot pattern 10 may be provided in various forms to disperse the light source incident from the side to the front surface, and may be formed by a printing method, an injection method, an imprinting method, a laser processing method, a V-cutting method, or a stamp method. , It is not necessarily limited to the above method.
  • the dot pattern 10 may be changed in any one of a triangular, rectangular, bar, elliptical, circular, donut, cylindrical, curved, oblique, and polygonal shape, but the dot pattern 10 )
  • the form is not necessarily limited to the above-mentioned form.
  • the shape of the dot pattern 10 can be changed as needed, and methods for changing the shape include mechanical processing, laser processing, sanding processing, injection molding, press molding, extrusion molding, stamp molding, pressure molding, and water jet molding methods. It is not necessarily limited to the above-mentioned shape change method.
  • the dot groups 20 in which the dot patterns 10 are densely packed may be transformed into a square, a rhombus, a circle, an ellipse, a triangle, or a bar shape according to the arrangement of the dot patterns 10, but are necessarily limited to the above-described shapes. it is not going to be
  • the formed dot pattern 10 may be formed in a size of 30 to 100 ⁇ m, and serves to refract light sources incident from the side and disperse them in various angles.
  • the light guide plate 100 is made of PMMA (Poly Methylmethacrylate), MS (Methylmethacrlate Styrens), PS (Poly Styrene), PC (Poly Carbonate), PET (polyethylene), which is one of transparent materials capable of transmitting light. It may be formed of plastic or resin such as terephthalate).
  • the light guide plate 100 receives light from one surface and emits light to the front surface to uniformly distribute the light over the entire area. If light is directly emitted from a general surface light source or surface light source, it is likely to be recognized as defects and scratches due to impurities generated during the process due to the straightness of light.
  • a dot pattern 10 and a dot group 20 in which the dot patterns 10 are concentrated may be formed on the bottom surface of the light guide plate 100 .
  • the light guide plate 100 has a propagation area 50 in the propagation direction of the light source due to the straightness of the light source and a non-propagation area 40 of the light source out of the propagation area 50.
  • Non-uniform characteristics may appear on the front.
  • the light source device 200 may include at least one light source unit 30 , and the propagation area 50 of the light source may be controlled according to an interval between the light source units 30 .
  • the light source device 200 may be a back light unit (BLU), and the light source unit 30 may be a light emitting diode (LED).
  • the light source device 200 of FIGS. 1 to 9 shows a form in which the location of the light source is arranged at a predetermined location to explain an embodiment, but the location of the light source device 200 is not limited to one embodiment. That is, the location of the light source device 200 is not limited to the illustrated drawing.
  • FIG. 2 is a cross-sectional view of a light guide plate to which a mold and general dot groups are applied according to an embodiment
  • FIG. 3 is a view showing a light guide plate to which an actual mold and general dot groups are applied according to an embodiment.
  • the dot groups 20 in which the dot patterns 10 are densely formed are equally spaced and random. can be formed at intervals.
  • the light source when a light source is incident on the light guide plate 100, the light source is dispersed by the dot groups in which dot patterns are grouped, and at this time, a bright part and a dark part appear in the appearance generated from the front end of the light source.
  • the above two problems can be solved by adjusting the pattern density at the front end of the light source, but in the case of the dot group 20, various problems have been encountered due to the limitation of adjusting the pattern spacing.
  • the function of grouping the pattern may be faded due to the low appearance shielding power due to the defect of foreign matter, so various approaches have been taken to solve the above problem.
  • the bright part may be the propagation area 50 of the area where the light source generated from the light source unit 30 propagates, and the dark part may be the non-propagation area 40 excluded from the propagation area 50 of the light source between each light source unit 30. ) can be.
  • FIG. 4 is a cross-sectional view showing light dispersion of a light guide plate to which general dot groups are applied according to an embodiment
  • FIG. 5 is a cross-sectional view showing light dispersion of a light guide plate to which normal dot groups and mold are applied according to an embodiment.
  • the light guide plate 100 to which the general dot group 20 is applied and the light guide plate 100 to which the general dot group 20 and the mold 300 according to an embodiment are applied are at the light incident surface. It shows the shielding power of the light source by the mold 300 of the light source device 200 with respect to the non-uniformity of the light source. As the distance between light sources gradually widens amid price competition, the function of shielding a certain area by the mold 300 is almost offset.
  • the light is scattered and dispersed at the front end of the light source unit 30 and appears strong up to a certain area, taking into account the radiation angle 2 of the light source unit 30 and the refraction of light by the pattern. Even if it does, the light source does not propagate between the light source parts 30, so it appears as a dark part.
  • the light source of the light source unit 30 shows a uniform appearance due to reflection and refraction.
  • the dot pattern 10 is formed in a certain area based on the front end of the light source unit 30 and the light incident surface, and the dot group 20 is used in the subsequent area to solve the appearance problem occurring at the front end of the light source. At the same time, visibility due to foreign matter and defects through the dot group 20 was improved.
  • Table 1 below shows the visibility of the boundary area according to the area setting of the dot pattern 10 in FIG. The closer to the light source, the clearer the pattern boundary between the dot pattern (10) area and the dot group (20) area due to the influence of the light source, and the intersection by the radiation angle (2) of the light source and refraction by the pattern in the 8 to 10 mm area and the appearance of a visually uniform light distribution by reflection. As the area of the dot pattern 10 widens to 12 mm or more, the pattern boundary appears more clearly.
  • the density of the dot pattern 10 was reduced in front of the light source unit 30 to induce refraction of light, and the density of the dot pattern 10 was increased between the light source units 30 to refract and emit light.
  • This design value may vary depending on the lenticular angle and direction of the sheet, and the air layer between the sheet and the light guide plate 100 .
  • Table 2 shows the visibility of the pattern boundary according to adjusting the density of the dot pattern 10.
  • Table 3 below is a table showing the visibility of defects in terms of the number of defects when the dot patterns 10 are grouped. As shown in Table 2, when the number of dot patterns 10 of the dot group 20 is 4 or less, as shown in Table 2, the number of defects increases, but the visibility of the border area decreases, but the dot pattern of the dot group 20 ( 10) While the number of defects decreases when the number is 14 to 15, the visibility of the boundary area increases conversely.
  • Tables 2 and 3 above can be applied in various ways from monitor model 21.5 inches (") to TV model 85 inches ("), and there is a difference in the distance of the dot pattern 10 area close to the light source. indicates that it can be applied.
  • each light source unit 30 When the intermediate points of the conditions of Tables 1, 2, and 3 are applied, it is possible to improve appearance problems by optimizing the spacing and structural design of each light source unit 30 . Considering that the general radiation angle (2) of the LED optical element is 120°, the height of the visible part and the dark part may be lowered.
  • the straightness of light is increased by lowering the density of the dot pattern 10, and the probability of the light source being refracted to the pattern and the reflective sheet is lowered, thereby lowering the height of the curved part.
  • the light source induced by diffraction and refraction at the front end of the light source unit 30 increases the probability of emitting light by the high-density dot pattern 10 in the non-propagation area 40 between the light source units 30, thereby lowering the height of the dark part.
  • the uniformity of light distribution is remarkably increased at a short distance of the light source, the area of the dot pattern 10 is narrowed and the boundary area between the dot pattern 10 and the dot group 20 is improved.
  • the light guide plate 100 to which the mold 300 is applied has an even appearance as a whole even when no sheet is applied. If a plurality of sheets are fastened and the appearance is checked, a more uniform appearance of light distribution may appear.
  • FIG. 6 is a cross-sectional view illustrating a light guide plate to which dot patterns of a propagation area and a non-propagation area of a light source are randomly arranged according to an embodiment
  • FIG. 7 is a dot pattern of a propagation area and a non-propagation area of a light source according to an embodiment. This is a cross-sectional view showing the light guide plate applied in precise arrangement.
  • the dot patterns 10 of the propagation area 50 and the non-propagation area 40 are randomly arranged and equally spaced at intervals of each dot pattern 10. It can be formed in precise arrangement.
  • the intervals of the dot patterns 10 are provided in either a random arrangement or a precise arrangement, but the intervals of the dot groups 20 may be provided in a random arrangement with a random arrangement or a precision arrangement with equal intervals.
  • FIG. 8 is a cross-sectional view showing light dispersion of a light guide plate having improved external visibility according to an exemplary embodiment
  • FIG. 9 is a cross-sectional view showing light dispersion of a light guide plate having improved external visibility to which a mold is applied according to an exemplary embodiment.
  • the light source generated from the light source unit 30 forms a low-density dot pattern 10 in the propagation area 50 at the front end of the light source unit 30.
  • the straightness of the light source is increased, and in the non-propagation area 40 between each light source unit 30, as the light source reflected by refraction and diffraction increases, the light source unit 30 and the light source unit 30 according to the interval between the light source units 30 and Dark areas can be improved.
  • the distribution of the light source can be more uniformly distributed.

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

Abstract

La présente invention concerne une plaque de guidage de lumière ayant une visibilité extérieure améliorée à l'aide d'un motif complexe et un dispositif d'affichage la comprenant, la plaque de guidage de lumière ayant une visibilité extérieure améliorée à l'aide d'un motif complexe qui reçoit la lumière incidente provenant d'une unité de source de lumière et l'émet vers une surface avant de celle-ci, une pluralité de motifs de points pour distribuer de la lumière étant disposés sur la surface faisant face à une surface d'émission de lumière à partir de laquelle la lumière est émise, les motifs de points étant disposés avant le point d'intersection de lumière, et la densité de la zone de propagation et la densité d'une zone de non-propagation entre chaque unité de source de lumière exclue de la zone de propagation étant prévues pour être différente l'une de l'autre. Par conséquent, la présente invention peut fournir un aspect de haute qualité uniforme à un écran à cristaux liquides par amélioration du phénomène de visualisation de lumière irrégulière qui se produit selon la structure de conception d'un dispositif à DEL, améliorer la qualité d'affichage au moment de la production de masse, et économiser des coûts de fabrication par optimisation d'une structure de conception de source de lumière.
PCT/KR2022/021303 2022-01-06 2022-12-26 Plaque de guidage de lumière ayant une visibilité extérieure améliorée à l'aide d'un motif complexe et dispositif d'affichage la comprenant WO2023132545A1 (fr)

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KR1020220002206A KR20230106379A (ko) 2022-01-06 2022-01-06 복합패턴으로 외관 시인성이 향상된 도광판 및 이를 포함하는 디스플레이 장치
KR10-2022-0002206 2022-01-06

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JP2006278348A (ja) * 2001-05-22 2006-10-12 Nichia Chem Ind Ltd 面発光装置の導光板
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KR20080000408A (ko) * 2006-06-27 2008-01-02 엘지.필립스 엘시디 주식회사 백 라이트 어셈블리 및 이를 구비하는 액정표시장치
KR101010984B1 (ko) * 2010-05-10 2011-01-26 레이젠 주식회사 복합 패턴을 갖는 도광판 및 이의 제조방법
KR20110027185A (ko) * 2009-09-10 2011-03-16 엘지이노텍 주식회사 도광판 및 이를 구비한 백라이트 유닛

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Publication number Priority date Publication date Assignee Title
KR101872348B1 (ko) 2011-06-22 2018-06-29 삼성디스플레이 주식회사 백라이트용 도광판 및 그 제조 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006278348A (ja) * 2001-05-22 2006-10-12 Nichia Chem Ind Ltd 面発光装置の導光板
KR20070083084A (ko) * 2006-02-20 2007-08-23 주식회사 나모텍 백라이트 도광판
KR20080000408A (ko) * 2006-06-27 2008-01-02 엘지.필립스 엘시디 주식회사 백 라이트 어셈블리 및 이를 구비하는 액정표시장치
KR20110027185A (ko) * 2009-09-10 2011-03-16 엘지이노텍 주식회사 도광판 및 이를 구비한 백라이트 유닛
KR101010984B1 (ko) * 2010-05-10 2011-01-26 레이젠 주식회사 복합 패턴을 갖는 도광판 및 이의 제조방법

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