WO2013100482A1 - Light guide plate and backlight unit including same - Google Patents

Light guide plate and backlight unit including same Download PDF

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Publication number
WO2013100482A1
WO2013100482A1 PCT/KR2012/011128 KR2012011128W WO2013100482A1 WO 2013100482 A1 WO2013100482 A1 WO 2013100482A1 KR 2012011128 W KR2012011128 W KR 2012011128W WO 2013100482 A1 WO2013100482 A1 WO 2013100482A1
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WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
pattern
light
angle
Prior art date
Application number
PCT/KR2012/011128
Other languages
French (fr)
Korean (ko)
Inventor
이명원
송인규
최정민
Original Assignee
동우화인켐 주식회사
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Publication of WO2013100482A1 publication Critical patent/WO2013100482A1/en

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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
    • 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
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • 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

Definitions

  • the present invention relates to a light guide plate having improved straightness and brightness of emitted light and a backlight unit including the same.
  • Image display apparatuses which are mainly dominated by conventional CRT monitors, have recently been rapidly developed, and wider, lighter and even bent image display apparatuses such as LCDs, OLEDs, and electronic papers have been introduced one after another. Moreover, as the research on image display apparatuses is actively conducted, a large area image display apparatus is being developed competitively.
  • screen dividing driving divides the backlight unit into a plurality of regions, and the light source corresponding to the black portion of the image by linking the luminance (brightness) with the image signal. It is a technology that greatly reduces the brightness and improves the brightness ratio by increasing the brightness of the bright part, and at the same time increases the sharpness.
  • a light guide plate which emits light emitted from a light source so as to be uniform and straight in high luminance is required.
  • Korean Laid-Open Patent Publication No. 2011-50270 proposes a light guide plate having a laser engraved pattern at a lower portion thereof and a prism pattern at an upper portion thereof, but there is still a problem in improving the linearity of the surface light source.
  • Patent Document 1 Korea Patent Publication No. 2011-50270
  • An object of the present invention is to provide a light guide plate having excellent linearity and brightness of emitted light.
  • an object of the present invention is to provide a backlight unit having the light guide plate.
  • the prism pattern is provided on the upper surface, and the upper prism has a top vertex portion of the vertical cross section, and the base length P of the upper vertical cross section is 50 ⁇ m to 100 ⁇ m, and the sector center angle of the arc is A light guide plate of 2 ° to 95 °, the base angle (A) of the upper vertical section is 30 ° to 50 °.
  • the light guide plate having a light scattering pattern on the lower surface.
  • the light scattering pattern is an embossed line-shaped pattern having a plurality of ink printing patterns thereon, and the ink printing pattern gradually densifying away from where the light source is located.
  • a backlight unit provided with the light guide plate of any one of 1 to 11.
  • the image display device provided with the backlight unit of the above 12.
  • the light guide plate of the present invention can be usefully used to implement screen division driving by improving the linearity of the emitted light by providing a round prism pattern on the upper surface.
  • the screen display device provided with the light guide plate of the present invention enables uniform emission of light without a hot spot.
  • the screen display device provided with the light guide plate of the present invention can display a screen having excellent contrast ratio and clarity due to an excellent effect of implementing screen division driving.
  • FIG. 1 is a schematic vertical cross-sectional view of an example of a round prism of the present invention.
  • FIG. 2 is a schematic perspective view of an example of a backlight unit of the present invention.
  • FIG. 3 is a schematic vertical cross-sectional view of an example of the backlight unit of the present invention.
  • FIG. 4 is a view showing a straightness evaluation method of the present invention.
  • Example 6 is a graph showing the straightness and average brightness of Test Example 1 of the present invention.
  • 11 is an example of the bottom surface pattern of the light guide plate of the present invention (100: light guide plate, 101: base material, 102: bottom surface line pattern, 103: ink printing pattern).
  • 12 is an example of the bottom surface pattern of the light guide plate of the present invention (100: light guide plate, 101: base material, 102: bottom surface line pattern, 104: groove portion).
  • a prism pattern is provided on an upper surface, and the prism has a top vertex portion of a vertical cross section of which is an arc shape, and a base length (P) of the vertical cross section is 50 ⁇ m to 100 ⁇ m, and the sector center angle of the arc ( ⁇ ) Is 2 ° to 95 °, and the base angle A of the vertical cross section is 30 ° to 50 °, and thus relates to a light guide plate having excellent linearity and high brightness of emitted light and a backlight unit including the same.
  • the upper surface of the light guide plate of the present invention is provided with a prism pattern.
  • Such a prism pattern includes a prism whose upper vertex portion of the vertical cross section is an arc shape, that is, a pattern in which a round prism is repeatedly formed in a straight ridge shape.
  • a round prism is a shape of an arc in which the top vertex portion of the vertical cross section is curved, unlike a conventional prism whose vertical cross section is a triangle (eg, an equilateral triangle, an isosceles triangle, etc.).
  • the round prism constituting the prism pattern satisfies the following requirements.
  • the upper vertex portion of the vertical cross section has an arc shape
  • the base length P of the vertical cross section is 50 ⁇ m to 100 ⁇ m
  • the circular center prism angle ⁇ of the arc is 2 ° to 95 °
  • the vertical cross section The base angle A of is from 30 ° to 50 °.
  • FIG. 1 is a schematic form of a vertical cross section of an example of a round prism of the present invention.
  • the vertical cross-section of the round prism of FIG. 1 is symmetrical, with the upper vertex portion of the prism having the shape of an arc.
  • the vertical cross section of the round prism of the present invention does not necessarily need to be symmetrical.
  • the base length P of the vertical cross section of the round prism of the present invention is 50 ⁇ m to 100 ⁇ m, preferably 60 to 80 ⁇ m. It is advantageous in terms of the straightness and luminance of the light emitted from the light guide plate having a base length P of 50 ⁇ m to 100 ⁇ m.
  • the upper vertex portion of the vertical cross section has an arc shape, and the sector center angle ⁇ is 2 ° to 95 °.
  • the fan center angle ⁇ is preferably 15 ° to 70 °, more preferably 16.5 ° to 54.5 °. If the arc center angle ⁇ of the arc is less than 2 ° or greater than 95 °, the linearity and luminance of the light emitted from the light guide plate are significantly reduced.
  • the base angle A of the vertical cross section of the round prism has a value of 30 ° to 50 °, and preferably 35 ° to 50 °. If the base angle A of the vertical cross section of the round prism is less than 30 ° or more than 50 °, there is a problem that the straightness and brightness of the emitted light are deteriorated.
  • a line connecting both end points of the upper arc to both end points of the base is a straight line. That is, when drawing an imaginary line parallel to the base between the two ends of the base and the both ends of the top arc, the angle between the line connecting the two ends of the top arc and the imaginary line at both ends of the base is equal to the base angle (A). .
  • the lower base length (P) of the vertical cross section of the round prism, the central center angle ( ⁇ ) of the arc of the round prism, and the lower internal angle (A) of the vertical cross section of the round prism pattern all fall within the specific ranges described above.
  • the linearity and luminance of the light emitted from the light guide plate are simultaneously improved.
  • the ratio of the central fan angle ⁇ and the base angle A of 1: 0.32 to 1:25 is good for improving luminance while improving straightness.
  • the luminance is improved while improving straightness.
  • the sector center angle ⁇ is 16 degrees to 80 degrees.
  • the center of the circle (origin O) including the upper arc of the round prism corresponds to the above-mentioned specific range of the three parameters. If it is a range having a value to be located above, it may be located above the bottom base or outside of the round prism. Accordingly, the sector radius R including the upper arc of the round prism may have various values.
  • the light guide plate of the present invention may have a light scattering pattern on its lower surface as needed (see FIGS. 3, 11, and 12).
  • the light scattering pattern may further improve the uniformity of light emitted through the upper surface of the light guide plate.
  • the shape of the light scattering pattern is used as a light scattering pattern in the art can be applied without particular limitation.
  • the lower surface pattern may be intaglio or embossed.
  • the shape of the pattern may be lenticular, lenticular, prismatic, polygonal, or the like.
  • the lenticular shape may have a cross-sectional shape, for example, semicircular, semi-elliptic, or the like.
  • these light scattering patterns may be disposed continuously or at predetermined intervals, and the scattering pattern density may increase or be constantly positioned as the light source moves away from the light source.
  • the bottom surface pattern may be an embossed line pattern, for example.
  • This pattern may be the same or different material as the substrate.
  • this pattern may comprise optically transparent resin.
  • optical transparent resin (meth) acrylic resin, polycarbonate resin, styrene resin, olefin resin, polyester resin, or the like may be used.
  • the lower surface line pattern may have various pattern cross sections, and there is no particular limitation on the shape thereof. For example, it may be a round prism pattern, a triangular-prism pattern, or a lenticular pattern.
  • the round-prism pattern means a pattern in which the cross-sectional shape of the pattern is a triangle having an arc shape at the top vertex
  • the triangle-prism pattern means a pattern in which the cross-sectional shape of the pattern is a triangle
  • the lenticular pattern means a pattern in which the cross-section of the pattern is semi-circular or semi-elliptic.
  • 11 illustrates an embodiment in which the ink print pattern 103 is formed only at the boundary portion of the line pattern, but may be formed in the peak portion of the line pattern in another embodiment, and in another embodiment, the inclined surface of the line pattern Can also be formed. In another embodiment, a larger area may be formed to cover multiple line patterns.
  • the shape of the ink print pattern is not particularly limited.
  • a spot type may be used as shown in FIG. 11.
  • the method of forming an ink print pattern is not particularly limited as long as it is a method of forming a print pattern on a line-shaped pattern, and examples thereof include screen printing, offset printing, and inkjet printing. Screen printing is desirable for the formation of fast, precise and uniform print patterns.
  • the light guide plate of the present invention can further improve the brightness and the straightness of the light emitted by providing a plurality of ink printing patterns whose intervals are varied in the line-shaped pattern embossed on the lower surface.
  • the lower surface of the light guide plate of the present application may have an embossed line-shaped pattern, and a plurality of grooves 104 may be provided on the line-shaped pattern, the distance of which is closer to the light source. .
  • the groove portion 104 may also be formed in the valley portion of the pattern, and in another embodiment, may be formed on the inclined surface of the pattern.
  • the groove forming method is not particularly limited as long as it can form a groove in the pattern, but it is preferable to form the groove by irradiating a laser in order to form a precise and uniform groove.
  • the light guide plate of the present invention can further improve the brightness and the straightness of the light emitted by providing a plurality of groove portions whose intervals are varied in the embossed line pattern.
  • the base resin of the light guide plate of the present invention may be used as long as the material used in the art.
  • at least one resin selected from acrylic resin, styrene-acrylic copolymer resin, styrene resin, styrene-acrylonitrile resin and polycarbonate resin can be used as the base resin.
  • the light guide plate may further include at least one of a ultraviolet absorber, a bluing agent, an antioxidant, and a release agent in addition to the base resin.
  • the light guide plate of the present invention may further include a functional layer on any one of the lower surface and the upper surface, or impart functionality to the light guide plate, like a conventional light guide plate.
  • a resin exemplified as the base resin of the light guide plate which is a base material layer, may be used.
  • the same resin as the base resin of the light guide plate may be used, but another one may be used.
  • the functional layer may further include at least one of a ultraviolet absorber, a heat stabilizer, an antioxidant, an antistatic agent, a fluorescent brightener and a release agent, and may include these functional materials in the base resin.
  • the manufacturing method of the light guide plate is not particularly limited, and various methods such as extrusion molding, vacuum molding, hot press molding, extrusion molding, film laminating method, solvent bonding method, surface coating method, ultraviolet curing method and thermosetting method can be used.
  • extrusion molding to ultraviolet curing method is preferable, and extrusion molding is preferable in consideration of manufacturing cost and productivity.
  • the light guide plate of the present invention may constitute a backlight unit together with a light source. Light emitted from the light source is incident on the side of the light guide plate.
  • the light source may be located on the side of the side or elsewhere.
  • An edge type backlight unit in which the light source is positioned opposite to the side of the light guide plate is preferable, but the light source may be located elsewhere as long as a separate reflecting means can properly inject light into the side of the light guide plate.
  • the light source may be positioned on one or both sides of the light guide plate.
  • the light source can be used without limitation, for example, a light emitting diode (LED), an organic light emitting diode (OLED), a hot cathode tube, a cold cathode tube, and the like.
  • LED light emitting diode
  • OLED organic light emitting diode
  • hot cathode tube hot cathode tube
  • cold cathode tube cold cathode tube
  • the direction of the round prism pattern 130 on the light guide plate 100 is
  • the light source 200 may be disposed at both ends in the longitudinal direction, or may be disposed such that the light source 200 is positioned at a position perpendicular to the direction.
  • the arrangement of the light source 200 at both ends in the longitudinal direction of the round prism pattern 130 reduces the hot spot and in terms of uniformity of the emitted light. It is advantageous.
  • a reflective sheet 300 may be additionally provided on the bottom surface of the light guide plate 100.
  • Reflective sheet 300 is for reflecting the light emitted to the lower portion of the light guide plate 100 to re-incident into the light guide plate 100, a general reflective sheet 300 used in the art can be used without limitation.
  • the upper surface of the light guide plate 100 may further include a diffusion sheet, a micro lens sheet, a prism sheet, a brightness enhancement (DBEF) sheet, a protective sheet, and the like, as necessary.
  • DBEF brightness enhancement
  • the light guide plate 100 of the present invention may be included as one component of an image display device.
  • the image display device is not particularly limited as long as a separate surface light source is required to display an image, and may be, for example, a liquid crystal display.
  • the light guide plate 100 as described above may also be used as one component for supplying a surface light source to a general lighting device.
  • a light guide plate made of PMMA (refractive index: 1.49) was manufactured, and a round prism pattern having a configuration shown in Table 1 below was formed on the light guide plate upper surface.
  • Example 1 Table 1 division Base length (P, ⁇ m) Sector center angle ( ⁇ , °) Lower Cabinet (A, °)
  • Example 1 50 3.4 40
  • Example 2 60 19.2 40
  • Example 3 70 30.9 40
  • Example 4 80 66.3 40
  • Example 5 90 82.1 40
  • Example 6 100 91.3 40
  • a light source including 10 million LED Rays was disposed on the side of the light guide plate, and the linearity and relative luminance of the light emitted from the light guide plate were measured under the condition of LED light emission angle of 120 ° and LED light intensity of 35 lumen.
  • the Nth block of LED light sources (each block contains 8-12 LED light sources) is turned on and all other light sources are turned off.
  • the light intensity of the light emitted from the straight line connecting the light source of the N-th block in the light guide plate was evaluated by the ratio of the brightness of the light emitted from the straight line connecting the light source of the N + 3th block. The smaller the ratio, the better the straightness of the light.
  • the luminance was measured using a luminance meter (model name: BM-7, TOPCON Japan).
  • the light exiting the light guide plate of the embodiments can be seen that the luminance is significantly increased or the linearity is excellent in the vicinity of the light source, referring to Table 2 and 6, the light guide plate of the embodiments It can be seen that the light exiting is excellent in straightness and average brightness.
  • a light guide plate made of PMMA (refractive index: 1.49) was manufactured, and a round prism pattern having the configuration shown in Table 3 below was formed on the light guide plate upper surface.
  • a light source consisting of 10 million LED Rays was placed on the side of the light guide plate, and the linearity and relative luminance of the light emitted from the light guide plate were measured under the condition of LED light emission angle of 120 ° and LED light intensity of 35 lumen. And FIG. 7 (luminance at each position) and FIG. 8 (straightness and average luminance).
  • the light exiting the light guide plate of the embodiments can be seen that the luminance is significantly increased in the vicinity of the light source is excellent in straightness, referring to Table 6 and 8, the light guide plate of the embodiments It can be seen that the light exiting is excellent in straightness and average brightness.
  • a light guide plate made of PMMA (refractive index: 1.49) was manufactured for the case where no pattern was formed on the light guide plate (plat), when the lenticular pattern was formed (Lens), and when the prism pattern was formed (prism), respectively.
  • the straightness and relative luminance of the light guide plate and the light of Example 3 were compared with respect to the light guide plates, and the results are shown in Tables 5 and 9 (luminance according to position) and FIG. 10 (straightness and average luminance).
  • the prism type it was manufactured in the same manner as in Example 3 except that the vertex of the top was acute, and in the case of the lenticular type, the height was 20 ⁇ m and the bottom was 40 ⁇ m in diameter. It was manufactured in the same manner as in Example 3 except that the pattern formed a line.
  • Example 3 shows that the light emitted from the LGP is significantly increased in the vicinity of the light source, so that the linearity of the LGP is excellent. have. In particular, in the case of the plat type and the lens type, it can be seen that the straightness is not very good.
  • Example 3 has both excellent linearity and brightness, but the prism type has better linearity and brightness than the present invention, and the lens type and plat type light guide plates have the best linearity and brightness. It can be seen that.

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  • Optics & Photonics (AREA)
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Abstract

The present invention relates to a light guide plate and to a backlight unit including same. Particularly, in the light guide plate, a prism pattern is disposed on the top surface of the light guide plate, and the vertex of the upper end of a vertical section of the prism has an arc shape. Also, the bottom side of the vertical section has a length of about 50 µm to about 100 µm, and the arc has a fan-shaped central angle of about 2° to about 95°. In addition, a base angle (A) in the vertical section ranges from about 30° to about 50°. Thus, the light guide plate has superior straightness and high brightness of emitted light.

Description

도광판 및 이를 포함하는 백라이트 유닛Light guide plate and backlight unit including the same
본 발명은 출사되는 광의 직진성 및 휘도가 개선된 도광판 및 이를 포함하는 백라이트 유닛에 관한 것이다.The present invention relates to a light guide plate having improved straightness and brightness of emitted light and a backlight unit including the same.
종래 CRT 모니터가 주종을 이루던 화상 표시 장치는 최근 그 기술이 비약적으로 발전하여 LCD, OLED, 전자종이 등 더 넓고 가벼우며 심지어 구부릴 수도 있는 화상 표시 장치들이 속속 소개되고 있다. 더욱이, 화상 표시 장치의 연구가 활발하게 이루어짐에 따라 대면적의 화상 표시 장치가 경쟁적으로 개발되고 있는 실정이다.BACKGROUND ART Image display apparatuses, which are mainly dominated by conventional CRT monitors, have recently been rapidly developed, and wider, lighter and even bent image display apparatuses such as LCDs, OLEDs, and electronic papers have been introduced one after another. Moreover, as the research on image display apparatuses is actively conducted, a large area image display apparatus is being developed competitively.
다만, 화상 표시 장치의 개발 방향은 화면의 확장에 있었으나, 최근에는 화면의 확장은 인간의 시야를 초과할 정도의 면적까지 가능하게 되어 그 한계에 도달하였으며, 그에 따라 해상도, 명암비, 색재현성 등의 화질 개선에 연구의 초점이 맞추어지고 있다.However, the development direction of the image display device was in the expansion of the screen, but in recent years, the expansion of the screen has been possible to reach an area that exceeds the human field of view, thus reaching the limit. Research is focused on improving picture quality.
이러한 화질 개선에 있어서 최근 소개된 기술 중 화면 분할 구동(로컬 디밍, local dimming)은 백라이트 유닛을 다수의 영역으로 구분하고, 휘도(밝기)를 영상 신호와 연계해 영상의 검은 색 부분에 해당되는 광원의 휘도를 저하시키고, 밝은 부분의 휘도를 높여서 명암비를 대폭 개선함과 동시에 선명도를 높이는 기술이다.Among the technologies recently introduced in improving image quality, screen dividing driving (local dimming) divides the backlight unit into a plurality of regions, and the light source corresponding to the black portion of the image by linking the luminance (brightness) with the image signal. It is a technology that greatly reduces the brightness and improves the brightness ratio by increasing the brightness of the bright part, and at the same time increases the sharpness.
이러한 화면 분할 구동이 효과적으로 구현되기 위해서는 광원으로부터 나오는 광을 높은 휘도로 균일하면서도 직진성이 있도록 출사시키는 도광판이 필요하다.In order to effectively implement such a screen division driving, a light guide plate which emits light emitted from a light source so as to be uniform and straight in high luminance is required.
이와 관련하여, 한국공개특허공보 제2011-50270호는 하부에 레이저 음각 패턴 및 상부에 프리즘 패턴을 구비한 도광판을 제안하고 있으나, 면광원의 직진성을 개선하는 데는 여전히 부족한 문제점이 있다.In this regard, Korean Laid-Open Patent Publication No. 2011-50270 proposes a light guide plate having a laser engraved pattern at a lower portion thereof and a prism pattern at an upper portion thereof, but there is still a problem in improving the linearity of the surface light source.
[선행기술문헌][Preceding technical literature]
[특허문헌][Patent Documents]
특허문헌 1: 한국 공개특허공보 2011-50270Patent Document 1: Korea Patent Publication No. 2011-50270
본 발명은 출사되는 광의 직진성 및 휘도가 우수한 도광판을 제공하는 것을 목적으로 한다.An object of the present invention is to provide a light guide plate having excellent linearity and brightness of emitted light.
또한, 본 발명은 상기 도광판을 구비한 백라이트 유닛을 제공하는 것을 목적으로 한다.In addition, an object of the present invention is to provide a backlight unit having the light guide plate.
1. 프리즘 패턴이 상면에 구비되고, 위 프리즘은 그 수직 단면의 상단 꼭지점 부분이 호의 형상이며, 위 수직 단면의 밑변 길이(P)는 50㎛ 내지 100 ㎛이고, 위 호의 부채꼴 중심각(θ)은 2°내지 95°이며, 위 수직 단면의 밑각(A)은 30° 내지 50°인 도광판.1. The prism pattern is provided on the upper surface, and the upper prism has a top vertex portion of the vertical cross section, and the base length P of the upper vertical cross section is 50 μm to 100 μm, and the sector center angle of the arc is A light guide plate of 2 ° to 95 °, the base angle (A) of the upper vertical section is 30 ° to 50 °.
2. 위 1에 있어서, 상기 부채꼴 중심각(θ)과 상기 밑각(A)의 비가 1:0.32 내기 1:25인 도광판.2. The light guide plate according to the above 1, wherein the ratio of the central fan angle θ and the base angle A is 1: 0.32 to 1:25.
3. 위 1에 있어서, 상기 부채꼴 중심각(θ)과 상기 밑각(A)의 비가 1:0.5 내기 1:2.5인 도광판.3. In the above 1, the ratio of the fan-shaped center angle (θ) and the base angle (A) 1: 0.5 to 1: 2.5 light guide plate.
4. 위 1에 있어서, 위 밑변 길이(P)가 60㎛ 내지 80 ㎛인 도광판.4. The light guide plate according to the above 1, wherein the upper base length P is 60 µm to 80 µm.
5. 위 1에 있어서, 위 부채꼴 중심각(θ)은 15°내지 70°인 도광판.5. The light guide plate according to the above 1, wherein the center fan angle θ is 15 ° to 70 °.
6. 위 1에 있어서, 위 부채꼴 중심각(θ)은 16.5°내지 54.5°인 도광판.6. The light guide plate according to the above 1, wherein the center fan angle (θ) is 16.5 ° to 54.5 °.
7. 위 1에 있어서, 위 밑각(A)은 35°내지 50°인 도광판.7. The light guide plate of 1 above, wherein the upper base angle (A) is 35 ° to 50 °.
8. 위 1에 있어서, 하면에 광산란 패턴을 갖는 도광판.8. In the above 1, the light guide plate having a light scattering pattern on the lower surface.
9. 위 8에 있어서, 위 광산란 패턴은 음각 또는 양각인 도광판.9. The light guide plate of 8 above, wherein the light scattering pattern is intaglio or embossed.
10. 위 8에 있어서, 위 광산란 패턴은 양각된 라인형 패턴으로서 그 상에 다수의 잉크 인쇄 패턴을 구비하고, 위 잉크 인쇄 패턴은 광원이 위치하는 곳에서부터 멀어질수록 점차 조밀해지는, 도광판.10. The light guide plate of 8 above, wherein the light scattering pattern is an embossed line-shaped pattern having a plurality of ink printing patterns thereon, and the ink printing pattern gradually densifying away from where the light source is located.
11. 위 8에 있어서, 위 광산란 패턴은 양각된 라인형 패턴으로서 그 상에 다수의 홈부를 구비하고, 위 홈부는 광원이 위치하는 곳에서부터 멀어질수록 점차 조밀해지는, 도광판.11. The light guide plate according to the above 8, wherein the light scattering pattern is an embossed line-shaped pattern having a plurality of grooves thereon, and the grooves gradually becoming denser as the light source is located.
12. 1 내지 11 중 어느 하나의 도광판이 구비된 백라이트 유닛.12. A backlight unit provided with the light guide plate of any one of 1 to 11.
13. 위 12의 백라이트 유닛이 구비된 화상 표시 장치.13. The image display device provided with the backlight unit of the above 12.
본 발명의 도광판은 상면에 라운드 프리즘 패턴을 구비함으로써 출사되는 광의 직진성을 향상시켜 화면 분할 구동을 구현하는데 유용하게 사용될 수 있다.The light guide plate of the present invention can be usefully used to implement screen division driving by improving the linearity of the emitted light by providing a round prism pattern on the upper surface.
본 발명의 도광판을 구비한 화면 표시 장치는 핫스팟이 존재하지 않는 광의 균일한 출사가 가능하다.The screen display device provided with the light guide plate of the present invention enables uniform emission of light without a hot spot.
본 발명의 도광판을 구비한 화면 표시 장치는 화면 분할 구동의 구현 효과가 우수하여 명암비 및 선명도가 우수한 화면의 표시가 가능하다.The screen display device provided with the light guide plate of the present invention can display a screen having excellent contrast ratio and clarity due to an excellent effect of implementing screen division driving.
도 1은 본 발명의 라운드 프리즘의 일례의 개략적인 수직 단면도이다.1 is a schematic vertical cross-sectional view of an example of a round prism of the present invention.
도 2는 본 발명의 백라이트 유닛의 일례의 개략적인 사시도이다.2 is a schematic perspective view of an example of a backlight unit of the present invention.
도 3은 본 발명의 백라이트 유닛의 일례의 개략적인 수직 단면도이다.3 is a schematic vertical cross-sectional view of an example of the backlight unit of the present invention.
도 4는 본 발명의 직진성 평가 방법을 나타낸 도면이다.4 is a view showing a straightness evaluation method of the present invention.
도 5는 본 발명의 시험예 1의 위치별 휘도를 나타낸 그래프이다.5 is a graph showing the luminance for each position of Test Example 1 of the present invention.
도 6은 본 발명의 시험예 1의 직진성 및 평균 휘도를 나타낸 그래프이다.6 is a graph showing the straightness and average brightness of Test Example 1 of the present invention.
도 7은 본 발명의 시험예 2의 위치별 휘도를 나타낸 그래프이다.7 is a graph showing the luminance for each position of Test Example 2 of the present invention.
도 8은 본 발명의 시험예 2의 직진성 및 평균 휘도를 나타낸 그래프이다.8 is a graph showing the straightness and average brightness of Test Example 2 of the present invention.
도 9는 본 발명의 시험예 3의 위치별 휘도를 나타낸 그래프이다.9 is a graph showing the luminance for each position of Test Example 3 of the present invention.
도 10은 본 발명의 시험예 3의 직진성 및 평균 휘도를 나타낸 그래프이다.10 is a graph showing the straightness and average brightness of Test Example 3 of the present invention.
도 11은 본 발명의 도광판의 하면 패턴의 일례이다(100: 도광판, 101: 기재, 102: 하면 라인형 패턴, 103: 잉크 인쇄 패턴).11 is an example of the bottom surface pattern of the light guide plate of the present invention (100: light guide plate, 101: base material, 102: bottom surface line pattern, 103: ink printing pattern).
도 12는 본 발명의 도광판의 하면 패턴의 일례이다(100: 도광판, 101: 기재, 102: 하면 라인형 패턴, 104: 홈부).12 is an example of the bottom surface pattern of the light guide plate of the present invention (100: light guide plate, 101: base material, 102: bottom surface line pattern, 104: groove portion).
본 발명은 프리즘 패턴이 상면에 구비되고, 상기 프리즘은 그 수직 단면의 상단 꼭지점 부분이 호의 형상이며, 상기 수직 단면의 밑변 길이(P)는 50㎛ 내지 100 ㎛이고, 상기 호의 부채꼴 중심각(θ)은 2°내지 95°이며, 상기 수직 단면의 밑각(A)은 30° 내지 50°로 구성됨으로써 출사되는 광의 직진성이 우수하고 휘도가 높은 도광판 및 이를 포함하는 백라이트 유닛에 관한 것이다.According to the present invention, a prism pattern is provided on an upper surface, and the prism has a top vertex portion of a vertical cross section of which is an arc shape, and a base length (P) of the vertical cross section is 50 μm to 100 μm, and the sector center angle of the arc (θ) Is 2 ° to 95 °, and the base angle A of the vertical cross section is 30 ° to 50 °, and thus relates to a light guide plate having excellent linearity and high brightness of emitted light and a backlight unit including the same.
이하, 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail.
본 발명의 도광판의 상면에는 프리즘 패턴이 구비되어 있다.The upper surface of the light guide plate of the present invention is provided with a prism pattern.
이러한 프리즘 패턴은 수직 단면의 상단 꼭지점 부분이 호의 형상인 프리즘, 즉, 라운드 프리즘이 직선 리지 형상으로 반복 형성된 패턴을 포함한다. 라운드 프리즘은 수직 단면이 삼각형(예컨대, 정삼각형, 이등변 삼각형 등)인 통상의 프리즘과 달리 수직 단면의 상단 꼭지점(정점) 부분이 곡선인 호의 형상이다.Such a prism pattern includes a prism whose upper vertex portion of the vertical cross section is an arc shape, that is, a pattern in which a round prism is repeatedly formed in a straight ridge shape. A round prism is a shape of an arc in which the top vertex portion of the vertical cross section is curved, unlike a conventional prism whose vertical cross section is a triangle (eg, an equilateral triangle, an isosceles triangle, etc.).
프리즘 패턴을 이루는 라운드 프리즘은 하기와 같은 요건을 충족하는 것이다.The round prism constituting the prism pattern satisfies the following requirements.
라운드 프리즘은 그 수직 단면의 상단 꼭지점 부분이 호의 형상이며, 상기 수직 단면의 밑변 길이(P)는 50㎛ 내지 100 ㎛이고, 상기 호의 부채꼴 중심각(θ)은 2°내지 95°이며, 상기 수직 단면의 밑각(A)은 30° 내지 50°이다.In the round prism, the upper vertex portion of the vertical cross section has an arc shape, the base length P of the vertical cross section is 50 μm to 100 μm, and the circular center prism angle θ of the arc is 2 ° to 95 °, and the vertical cross section The base angle A of is from 30 ° to 50 °.
도 1은 본 발명의 라운드 프리즘의 일례의 수직 단면의 개략적인 형태이다.1 is a schematic form of a vertical cross section of an example of a round prism of the present invention.
도 1의 라운드 프리즘의 수직 단면은 좌우 대칭인 형태로서, 프리즘의 상단 꼭지점 부분이 호의 형태를 갖는다. 본 발명의 라운드 프리즘의 수직 단면이 반드시 좌우 대칭일 필요는 없다.The vertical cross-section of the round prism of FIG. 1 is symmetrical, with the upper vertex portion of the prism having the shape of an arc. The vertical cross section of the round prism of the present invention does not necessarily need to be symmetrical.
본 발명의 라운드 프리즘의 수직 단면의 밑변 길이(P)는 50㎛ 내지 100 ㎛, 바람직하게 60 내지 80 ㎛이다. 밑변 길이(P)가 50㎛ 내지 100 ㎛인 것이 도광판에서 출사되는 광의 직진성 및 휘도의 측면에서 유리하다.The base length P of the vertical cross section of the round prism of the present invention is 50 µm to 100 µm, preferably 60 to 80 µm. It is advantageous in terms of the straightness and luminance of the light emitted from the light guide plate having a base length P of 50 µm to 100 µm.
본 발명의 라운드 프리즘은 그 수직 단면의 상단 꼭지점 부분이 호의 형상이며, 그 부채꼴 중심각(θ)은 2°내지 95°이다. 부채꼴 중심각(θ)은 바람직하게 15°내지 70°, 보다 바람직하게 16.5°내지 54.5°이다. 호의 부채꼴 중심각(θ)이 2°미만이거나 95°초과이면 도광판에서 출사되는 광의 직진성 및 휘도가 현저히 저하된다.In the round prism of the present invention, the upper vertex portion of the vertical cross section has an arc shape, and the sector center angle θ is 2 ° to 95 °. The fan center angle θ is preferably 15 ° to 70 °, more preferably 16.5 ° to 54.5 °. If the arc center angle θ of the arc is less than 2 ° or greater than 95 °, the linearity and luminance of the light emitted from the light guide plate are significantly reduced.
본 발명에 있어서, 라운드 프리즘의 수직 단면의 밑각(A)은 30° 내지 50°의 값을 가지며, 바람직하게는 35° 내지 50°이다. 라운드 프리즘의 수직 단면의 밑각(A)이 30°미만이거나 50°초과이면 출사되는 광의 직진성 및 휘도가 저하되는 문제가 있다.In the present invention, the base angle A of the vertical cross section of the round prism has a value of 30 ° to 50 °, and preferably 35 ° to 50 °. If the base angle A of the vertical cross section of the round prism is less than 30 ° or more than 50 °, there is a problem that the straightness and brightness of the emitted light are deteriorated.
본 발명의 라운드 프리즘은 밑변의 양 끝점에서 상단 호의 양 끝점을 잇는 선이 직선이다. 즉, 밑변의 양 끝점과 상단 호의 양 끝점 사이에 밑변과 평행한 가상의 선을 그을 경우, 밑변의 양 끝점에서 상단 호의 양 끝점을 잇는 선과 그 가상의 선이 이루는 각도는 밑각(A)과 같다.In the round prism of the present invention, a line connecting both end points of the upper arc to both end points of the base is a straight line. That is, when drawing an imaginary line parallel to the base between the two ends of the base and the both ends of the top arc, the angle between the line connecting the two ends of the top arc and the imaginary line at both ends of the base is equal to the base angle (A). .
본 발명에 있어서, 라운드 프리즘의 수직 단면의 하단 밑변 길이(P), 라운드 프리즘의 호의 부채꼴 중심각(θ), 라운드 프리즘 패턴의 수직 단면의 하부 내각(A) 모두가 전술한 특정한 범위에 해당될 경우, 도광판으로부터 출사되는 광의 직진성 및 휘도가 동시에 향상된다.In the present invention, when the lower base length (P) of the vertical cross section of the round prism, the central center angle (θ) of the arc of the round prism, and the lower internal angle (A) of the vertical cross section of the round prism pattern all fall within the specific ranges described above. The linearity and luminance of the light emitted from the light guide plate are simultaneously improved.
특히, 부채꼴 중심각(θ)과 밑각(A)의 비가 1:0.32 내지 1:25인 것이 직진성을 향상시키면서 휘도를 향상시키는데 좋다.In particular, the ratio of the central fan angle θ and the base angle A of 1: 0.32 to 1:25 is good for improving luminance while improving straightness.
보다 바람직하게는 부채꼴 중심각(θ)과 밑각(A)의 비(θ:A)가 1:0.5 내지 1:2.5인 경우 직진성을 향상시키면서 휘도를 향상시키는데 더욱 좋다. 예컨대, 라운드 프리즘의 양쪽 밑각(A)이 각각 40°로 설정된 경우 그 부채꼴 중심각(θ)은 16°내지 80°이다.More preferably, when the ratio (θ: A) of the fan-shaped center angle θ and the base angle A is 1: 0.5 to 1: 2.5, the luminance is improved while improving straightness. For example, when both bottom angles A of the round prism are set to 40 degrees, the sector center angle θ is 16 degrees to 80 degrees.
본 발명의 일 구현예를 도시한 도 1을 참고하면, 본 발명에 있어서 라운드 프리즘의 상단 호를 포함하는 원의 중심(원점(O))은, 전술한 3개의 파라미터가 전술한 특정한 범위에 해당하는 값을 갖는 범위라면 하단 밑변 위 또는 라운드 프리즘의 외부에 위치할 수 있다. 그에 따라 라운드 프리즘의 상단 호를 포함하는 부채꼴의 반지름(R)은 다양한 값을 가질 수 있다.Referring to Fig. 1 showing an embodiment of the present invention, in the present invention, the center of the circle (origin O) including the upper arc of the round prism corresponds to the above-mentioned specific range of the three parameters. If it is a range having a value to be located above, it may be located above the bottom base or outside of the round prism. Accordingly, the sector radius R including the upper arc of the round prism may have various values.
본 발명의 도광판은 필요에 따라 그 하면에 광산란 패턴을 가질 수 있다(도 3, 도 11, 도 12 참고). 이러한 광산란 패턴을 통해 도광판의 상면을 통해 출사되는 광의 균일도를 더욱 향상시킬 수 있다.The light guide plate of the present invention may have a light scattering pattern on its lower surface as needed (see FIGS. 3, 11, and 12). The light scattering pattern may further improve the uniformity of light emitted through the upper surface of the light guide plate.
하면 광산란 패턴의 형태는 당 분야에서 광산란 패턴으로 사용되는 것이라면 특별한 제한 없이 적용될 수 있다.If the shape of the light scattering pattern is used as a light scattering pattern in the art can be applied without particular limitation.
하면 패턴은 음각 또는 양각일 수 있다. 패턴의 형태는 렌즈형, 렌티큘러형, 프리즘형, 다각형 등 일 수 있다. 렌티큘러형은 그 단면의 형태가 예컨대 반원형, 반타원형 등을 가질 수 있다. 또한, 이들 광산란 패턴은 연속적 또는 소정의 간격으로 배치될 수도 있으며, 광원으로부터 멀어짐에 따라 산란패턴밀도가 증가되거나, 일정하게 위치할 수도 있다.The lower surface pattern may be intaglio or embossed. The shape of the pattern may be lenticular, lenticular, prismatic, polygonal, or the like. The lenticular shape may have a cross-sectional shape, for example, semicircular, semi-elliptic, or the like. In addition, these light scattering patterns may be disposed continuously or at predetermined intervals, and the scattering pattern density may increase or be constantly positioned as the light source moves away from the light source.
하면 패턴은 예컨대 양각된 라인형 패턴일 수 있다. 이 패턴은 기재와 동일하거나 다른 재질일 수 있다. 예컨대 이 패턴은 광학적 투명수지를 포함할 수 있다. 광학적 투명 수지로는 (메타)아크릴계 수지, 폴리카보네이트계 수지, 스티렌계 수지, 올레핀계 수지, 폴리에스테르계 수지 등이 사용될 수 있다.The bottom surface pattern may be an embossed line pattern, for example. This pattern may be the same or different material as the substrate. For example, this pattern may comprise optically transparent resin. As the optical transparent resin, (meth) acrylic resin, polycarbonate resin, styrene resin, olefin resin, polyester resin, or the like may be used.
하면의 라인형 패턴은 다양한 패턴 단면을 가질 수 있으며, 그 형태에 특별한 제한은 없다. 예컨대, 라운드 프리즘 패턴, 삼각-프리즘 패턴 또는 렌티큘러 패턴일 수 있다.The lower surface line pattern may have various pattern cross sections, and there is no particular limitation on the shape thereof. For example, it may be a round prism pattern, a triangular-prism pattern, or a lenticular pattern.
하면에 형성되는 패턴의 경우, 라운드-프리즘 패턴이란 패턴의 단면 형태가 상단 꼭지점 부분이 호의 형태를 갖는 삼각형인 패턴을 의미하며, 삼각-프리즘 패턴이란 패턴의 단면 형태가 삼각형인 패턴을 의미하며, 렌티큘러 패턴이란 패턴의 단면의 형태가 반원형 또는 반타원형인 패턴을 의미한다. In the case of the pattern formed on the lower surface, the round-prism pattern means a pattern in which the cross-sectional shape of the pattern is a triangle having an arc shape at the top vertex, and the triangle-prism pattern means a pattern in which the cross-sectional shape of the pattern is a triangle, The lenticular pattern means a pattern in which the cross-section of the pattern is semi-circular or semi-elliptic.
잉크 인쇄 패턴이 형성되는 위치에는 특별한 제한이 없다. 도 11에는 잉크 인쇄 패턴(103)이 라인형 패턴의 경계 부분에만 형성되는 구현예가 도시되었으나, 다른 구현예에서는 라인형 패턴의 봉우리 부분에도 형성될 수 있으며, 또 다른 구현예에서는 라인형 패턴의 경사면에도 형성될 수 있다. 또 다른 구현예에서는 다수의 라인형 패턴을 덮도록 보다 큰 면적으로 형성될 수 있다.There is no particular limitation on the position where the ink print pattern is formed. 11 illustrates an embodiment in which the ink print pattern 103 is formed only at the boundary portion of the line pattern, but may be formed in the peak portion of the line pattern in another embodiment, and in another embodiment, the inclined surface of the line pattern Can also be formed. In another embodiment, a larger area may be formed to cover multiple line patterns.
잉크 인쇄 패턴의 형상은 특별히 제한되지 않는다. 예를 들어, 도 11에 도시된 바와 같이 스팟(spot)형을 사용할 수 있다.The shape of the ink print pattern is not particularly limited. For example, a spot type may be used as shown in FIG. 11.
잉크 인쇄 패턴의 형성 방법은 라인형 패턴에 인쇄 패턴을 형성할 수 있는 방법이라면 특별한 제한은 없으나 예를 들면 스크린 인쇄, 옵셋 인쇄, 잉크젯 인쇄 등을 들 수 있다. 신속하면서도 정밀하고 균일한 인쇄 패턴의 형성을 위해서는 스크린 인쇄 방식이 바람직하다.The method of forming an ink print pattern is not particularly limited as long as it is a method of forming a print pattern on a line-shaped pattern, and examples thereof include screen printing, offset printing, and inkjet printing. Screen printing is desirable for the formation of fast, precise and uniform print patterns.
본 발명의 도광판은 하면에 양각된 라인형 패턴에 그 간격이 변화되는 다수의 잉크 인쇄 패턴을 구비함으로써 출사되는 광의 휘도 및 직진성을 보다 개선시킬 수 있다.The light guide plate of the present invention can further improve the brightness and the straightness of the light emitted by providing a plurality of ink printing patterns whose intervals are varied in the line-shaped pattern embossed on the lower surface.
또 다른 경우, 도 12와 같이, 본원의 도광판의 하면에는 양각된 라인형 패턴이 있고, 그 라인형 패턴 상에 광원으로부터 멀어질수록 그 간격이 조밀해지는 다수의 홈부(104)를 구비할 수도 있다.In another case, as shown in FIG. 12, the lower surface of the light guide plate of the present application may have an embossed line-shaped pattern, and a plurality of grooves 104 may be provided on the line-shaped pattern, the distance of which is closer to the light source. .
홈부가 형성되는 위치에는 특별한 제한이 없다. 도 12에는 홈부(104)가 패턴의 봉우리 부분에만 형성되는 구현예가 도시되었으나, 본 발명의 다른 구현예에서는 패턴의 골짜기 부분에도 형성될 수 있으며, 또 다른 구현예에서는 패턴의 경사면에도 형성될 수 있다.There is no particular limitation on the position where the groove portion is formed. 12 illustrates an embodiment in which the groove 104 is formed only in the peak portion of the pattern, but in another embodiment of the present invention, the groove portion 104 may also be formed in the valley portion of the pattern, and in another embodiment, may be formed on the inclined surface of the pattern. .
홈부의 형성 방법은 패턴에 홈을 형성할 수 있는 방법이라면 특별한 제한은 없으나, 정밀하고 균일한 홈부의 형성을 위해서는 레이저를 조사하여 형성하는 것이 바람직하다.The groove forming method is not particularly limited as long as it can form a groove in the pattern, but it is preferable to form the groove by irradiating a laser in order to form a precise and uniform groove.
본 발명의 도광판은 양각된 라인형 패턴에 그 간격이 변화되는 다수의 홈부를 구비함으로써 출사되는 광의 휘도 및 직진성을 보다 현저하게 향상시킬 수 있다.The light guide plate of the present invention can further improve the brightness and the straightness of the light emitted by providing a plurality of groove portions whose intervals are varied in the embossed line pattern.
본 발명의 도광판의 베이스 수지는 본 기술분야에서 사용되는 재료라면 모두 사용될 수 있다. 예컨대 아크릴계 수지, 스티렌-아크릴계 공중합 수지, 스티렌계 수지, 스티렌-아크릴로니트릴계 수지 및 폴리카보네이트 수지 중 선택되는 1종 이상의 수지를 베이스 수지로 이용할 수 있다. 도광판은 베이스 수지 외에 자외선 흡수제, 블루잉제, 산화방지제, 이형제 중 하나 이상을 더 포함할 수 있다.The base resin of the light guide plate of the present invention may be used as long as the material used in the art. For example, at least one resin selected from acrylic resin, styrene-acrylic copolymer resin, styrene resin, styrene-acrylonitrile resin and polycarbonate resin can be used as the base resin. The light guide plate may further include at least one of a ultraviolet absorber, a bluing agent, an antioxidant, and a release agent in addition to the base resin.
본 발명의 도광판은 통상적인 도광판과 마찬가지로, 하면과 상면 중 어느 한 곳에 기능성층을 추가로 포함하거나, 도광판에 기능성을 부여할 수 있다. 기능성층의 베이스 수지는 기재층인 도광판의 베이스 수지로 예시한 수지를 사용할 수 있으며, 도광판의 베이스 수지와 같은 것을 사용할 수도 있으나, 다른 것을 사용할 수도 있다. 이와 같은 기능성층 내부에는 자외선 흡수제, 열안정제, 산화방지제, 대전방지제, 형광증백제, 이형제 중 하나 이상을 더 포함할 수 있으며, 베이스 수지에 이들 기능성 물질을 포함시킬 수도 있다.The light guide plate of the present invention may further include a functional layer on any one of the lower surface and the upper surface, or impart functionality to the light guide plate, like a conventional light guide plate. As the base resin of the functional layer, a resin exemplified as the base resin of the light guide plate, which is a base material layer, may be used. The same resin as the base resin of the light guide plate may be used, but another one may be used. The functional layer may further include at least one of a ultraviolet absorber, a heat stabilizer, an antioxidant, an antistatic agent, a fluorescent brightener and a release agent, and may include these functional materials in the base resin.
도광판의 제조방법은 특별히 제한되지 않으며, 압출 성형, 진공 성형, 열 프레스 성형, 압출 성형, 필름 적층법, 용제 접착법, 표면 코팅법, 자외선 경화법, 열 경화법 등 다양한 방법을 사용할 수 있다. 다만, 이 중 제조상 용이성을 고려하면 압출성형 내지 자외선 경화법이 바람직하며, 제작 비용 및 생산성을 고려하면 압출 성형이 바람직하다.The manufacturing method of the light guide plate is not particularly limited, and various methods such as extrusion molding, vacuum molding, hot press molding, extrusion molding, film laminating method, solvent bonding method, surface coating method, ultraviolet curing method and thermosetting method can be used. However, in view of ease of manufacturing, extrusion molding to ultraviolet curing method is preferable, and extrusion molding is preferable in consideration of manufacturing cost and productivity.
본 발명의 도광판은 광원 등과 함께 백라이트 유닛을 구성할 수 있다. 광원에서 출사된 광은 도광판의 측면으로 입사된다. 광원은 측면의 옆 쪽에 위치할 수도 있고 다른 곳에 위치할 수도 있다.The light guide plate of the present invention may constitute a backlight unit together with a light source. Light emitted from the light source is incident on the side of the light guide plate. The light source may be located on the side of the side or elsewhere.
광원이 도광판의 측면에 대향하여 위치하는 엣지형 백라이트 유닛이 바람직하나, 별도의 반사 수단이 도광판의 측면으로 적절히 광을 입사시킬 수 있다면 광원이 다른 곳에 위치하여도 무방하다. An edge type backlight unit in which the light source is positioned opposite to the side of the light guide plate is preferable, but the light source may be located elsewhere as long as a separate reflecting means can properly inject light into the side of the light guide plate.
엣지형 백라이트 유닛의 경우, 광원은 도광판의 어느 한쪽 또는 양쪽에 위치할 수 있다.In the case of an edge type backlight unit, the light source may be positioned on one or both sides of the light guide plate.
광원은 예컨대 발광 다이오드(LED), 유기 발광 다이오드(OLED), 열음극관, 냉음극관 등을 제한 없이 사용할 수 있다.The light source can be used without limitation, for example, a light emitting diode (LED), an organic light emitting diode (OLED), a hot cathode tube, a cold cathode tube, and the like.
본 발명에 따른 백라이트 유닛에 있어서, 도 3에 도시한 바와 같이, 광원(200)이 도광판(100)의 측면에 위치할 경우에, 도광판(100) 상부의 라운드 프리즘 패턴(130)의 방향은 그 길이방향으로 양 말단에 광원(200)이 위치하도록 배치되거나, 상기 방향과는 수직인 위치에 광원(200)이 위치하도록 배치될 수 있다.In the backlight unit according to the present invention, as shown in FIG. 3, when the light source 200 is located at the side of the light guide plate 100, the direction of the round prism pattern 130 on the light guide plate 100 is The light source 200 may be disposed at both ends in the longitudinal direction, or may be disposed such that the light source 200 is positioned at a position perpendicular to the direction.
바람직하게는 도 2에 개략적으로 도시된 바와 같이, 라운드 프리즘 패턴(130)의 방향이 그 길이방향으로 양 말단에 광원(200)이 위치하도록 배치되는 것이 핫스팟을 감소시키고 출사되는 광의 균일성 측면에서 유리하다.Preferably, as schematically shown in FIG. 2, the arrangement of the light source 200 at both ends in the longitudinal direction of the round prism pattern 130 reduces the hot spot and in terms of uniformity of the emitted light. It is advantageous.
또한, 도광판(100)의 하면에는 반사 시트(300)가 추가로 구비될 수 있다. 반사 시트(300)는 도광판(100)의 하부로 출사되는 광을 반사시켜 도광판(100) 내부로 재입사시키기 위한 것으로서, 본 기술분야에서 사용되는 일반적인 반사 시트(300)가 제한 없이 사용될 수 있다.In addition, a reflective sheet 300 may be additionally provided on the bottom surface of the light guide plate 100. Reflective sheet 300 is for reflecting the light emitted to the lower portion of the light guide plate 100 to re-incident into the light guide plate 100, a general reflective sheet 300 used in the art can be used without limitation.
한편, 도광판(100)의 상면에는 필요에 따라 확산 시트, 마이크로 렌즈 시트, 프리즘 시트, 휘도향상(DBEF) 시트, 보호 시트 등이 더 포함될 수 있다.Meanwhile, the upper surface of the light guide plate 100 may further include a diffusion sheet, a micro lens sheet, a prism sheet, a brightness enhancement (DBEF) sheet, a protective sheet, and the like, as necessary.
본 발명의 도광판(100)은 화상 표시 장치의 일 구성요소로서 포함될 수 있다. 상기 화상 표시 장치는 화상을 표시하기 위하여 별도의 면광원이 필요한 장치이면 특별히 한정되지 아니하며, 예를 들어 액정 표시 장치(Liquid Crystal Display) 등이 될 수 있다. 또한, 상술한 바와 같은 도광판(100)은 일반적인 조명 장치에 면광원을 공급하기 위한 일 구성요소로도 사용될 수도 있다.The light guide plate 100 of the present invention may be included as one component of an image display device. The image display device is not particularly limited as long as a separate surface light source is required to display an image, and may be, for example, a liquid crystal display. In addition, the light guide plate 100 as described above may also be used as one component for supplying a surface light source to a general lighting device.
이하에서는 본 발명의 실시예를 기술하나 본 발명의 권리범위가 하기 실시예에 의해 한정되는 것은 아니다.Hereinafter, examples of the present invention will be described, but the scope of the present invention is not limited to the following examples.
실시예 1-6: 밑변 변화Example 1-6: Base change
PMMA(굴절률: 1.49)로 제조된 도광판을 제조하였으며, 도광판 상면에 하기 표 1에 기재된 구성을 갖는 라운드 프리즘 패턴을 형성하였다.A light guide plate made of PMMA (refractive index: 1.49) was manufactured, and a round prism pattern having a configuration shown in Table 1 below was formed on the light guide plate upper surface.
표 1
구분 밑변 길이(P, ㎛) 부채꼴 중심각(θ, °) 하부 내각(A, °)
실시예 1 50 3.4 40
실시예 2 60 19.2 40
실시예 3 70 30.9 40
실시예 4 80 66.3 40
실시예 5 90 82.1 40
실시예 6 100 91.3 40
Table 1
division Base length (P, μm) Sector center angle (θ, °) Lower Cabinet (A, °)
Example 1 50 3.4 40
Example 2 60 19.2 40
Example 3 70 30.9 40
Example 4 80 66.3 40
Example 5 90 82.1 40
Example 6 100 91.3 40
시험예 1Test Example 1
상기 제조된 도광판 측면에 LED Ray 1,000만개로 이루어진 광원을 배치하고 LED 광출사각 120°, LED 광세기 35 lumen의 조건으로 도광판에서 출사되는 광의 직진성 및 상대휘도를 측정하였다.A light source including 10 million LED Rays was disposed on the side of the light guide plate, and the linearity and relative luminance of the light emitted from the light guide plate were measured under the condition of LED light emission angle of 120 ° and LED light intensity of 35 lumen.
직진성은 도 4에 개략적으로 도시된 바와 같이, N번째 블록의 LED 광원들(각 블록은 LED 광원을 8-12개 포함함)을 켜고(on) 다른 블록들의 광원들은 모두 끈(off) 경우에, 도광판에서 N 번째 블록의 광원을 잇는 직선부에서 나오는 광의 휘도에 대하여 N+3번째 블록의 광원을 잇는 직선부에서 나오는 광의 휘도의 비로 평가하였다. 상기 비율이 작을수록 광의 직진성은 우수하다. 휘도는 휘도계(모델명: BM-7, 일본 TOPCON사)를 사용하여 휘도를 측정하였다.As shown schematically in FIG. 4, the Nth block of LED light sources (each block contains 8-12 LED light sources) is turned on and all other light sources are turned off. The light intensity of the light emitted from the straight line connecting the light source of the N-th block in the light guide plate was evaluated by the ratio of the brightness of the light emitted from the straight line connecting the light source of the N + 3th block. The smaller the ratio, the better the straightness of the light. The luminance was measured using a luminance meter (model name: BM-7, TOPCON Japan).
상기 측정 결과를 하기 표 2 및 도 5(위치별 휘도)와 도 6(직진성 및 평균휘도)에 도시하였다.The measurement results are shown in Table 2 and FIG. 5 (luminance for each position) and FIG. 6 (straightness and average luminance).
표 2
구분 실시예1 실시예2 실시예3 실시예4 실시예5 실시예6
직진성(%) 18.7 18.8 15.9 17.0 18.1 19.5
평균휘도(nit) 880 926 951 937 869 880
TABLE 2
division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6
Straightness (%) 18.7 18.8 15.9 17.0 18.1 19.5
Average luminance (nit) 880 926 951 937 869 880
상기 표 2 및 도 5를 참고하면, 실시예들의 도광판을 출사하는 광은 광원 부근에서 휘도가 현저하게 상승하거나 직진성이 우수한 것을 알 수 있으며, 상기 표 2 및 도 6을 참고하면, 실시예들의 도광판을 출사하는 광은 직진성 및 평균휘도가 우수함을 알 수 있다.Referring to Tables 2 and 5, the light exiting the light guide plate of the embodiments can be seen that the luminance is significantly increased or the linearity is excellent in the vicinity of the light source, referring to Table 2 and 6, the light guide plate of the embodiments It can be seen that the light exiting is excellent in straightness and average brightness.
실시예 7-11: 하부 내각 변화Example 7-11: Lower Cabinet Change
PMMA(굴절률: 1.49)로 제조된 도광판을 제조하였으며, 도광판 상면에 하기 표 3에 기재된 구성을 갖는 라운드 프리즘 패턴을 형성하였다.A light guide plate made of PMMA (refractive index: 1.49) was manufactured, and a round prism pattern having the configuration shown in Table 3 below was formed on the light guide plate upper surface.
표 3
구분 밑변 길이(P, ㎛) 부채꼴 중심각(θ, °) 하부 내각(A, °)
실시예 7 70 2.5 30
실시예 8 70 16.5 35
실시예 9 70 30.9 40
실시예 10 70 43.2 45
실시예 11 70 54.4 50
TABLE 3
division Base length (P, μm) Sector center angle (θ, °) Lower Cabinet (A, °)
Example 7 70 2.5 30
Example 8 70 16.5 35
Example 9 70 30.9 40
Example 10 70 43.2 45
Example 11 70 54.4 50
시험예 2Test Example 2
상기 제조된 도광판 측면에 LED Ray 1,000만개로 이루어진 광원을 배치하고 LED 광출사각 120°, LED 광세기 35 lumen의 조건으로 도광판에서 출사되는 광의 직진성 및 상대휘도를 측정하였으며, 그 결과를 하기 표 4 및 도 7(위치별 휘도)과 도 8(직진성 및 평균휘도)에 도시하였다.A light source consisting of 10 million LED Rays was placed on the side of the light guide plate, and the linearity and relative luminance of the light emitted from the light guide plate were measured under the condition of LED light emission angle of 120 ° and LED light intensity of 35 lumen. And FIG. 7 (luminance at each position) and FIG. 8 (straightness and average luminance).
표 4
구분 실시예7 실시예8 실시예9 실시예10 실시예11
직진성(%) 23.9 18.3 15.9 14.2 12.5
평균휘도(nit) 949 927 951 927 948
Table 4
division Example 7 Example 8 Example 9 Example 10 Example 11
Straightness (%) 23.9 18.3 15.9 14.2 12.5
Average luminance (nit) 949 927 951 927 948
상기 표 4 및 도 7를 참고하면, 실시예들의 도광판을 출사하는 광은 광원 부근에서 휘도가 현저하게 상승하여 직진성이 우수한 것을 알 수 있으며, 상기 표 6 및 도 8을 참고하면, 실시예들의 도광판을 출사하는 광은 직진성 및 평균휘도가 우수함을 알 수 있다.Referring to Tables 4 and 7, the light exiting the light guide plate of the embodiments can be seen that the luminance is significantly increased in the vicinity of the light source is excellent in straightness, referring to Table 6 and 8, the light guide plate of the embodiments It can be seen that the light exiting is excellent in straightness and average brightness.
시험예 3: 패턴 단면 변화Test Example 3: Pattern Cross Section Change
도광판 상면에 아무런 패턴을 형성하지 않은 경우(plat), 렌즈형 패턴을 형성한 경우(Lens), 프리즘형 패턴을 형성한 경우(prism)에 대해 각각 PMMA(굴절률: 1.49)로 제조된 도광판을 제조하였으며, 상기 도광판들에 대해 실시예 3의 도광판과 광의 직진성 및 상대휘도를 비교 측정하였으며, 그 결과를 하기 표 5 및 도 9(위치별 휘도)와 도 10(직진성 및 평균휘도)에 도시하였다.A light guide plate made of PMMA (refractive index: 1.49) was manufactured for the case where no pattern was formed on the light guide plate (plat), when the lenticular pattern was formed (Lens), and when the prism pattern was formed (prism), respectively. The straightness and relative luminance of the light guide plate and the light of Example 3 were compared with respect to the light guide plates, and the results are shown in Tables 5 and 9 (luminance according to position) and FIG. 10 (straightness and average luminance).
프리즘형의 경우에는 상단의 꼭지점이 예각을 이루는 점을 제외하고는 실시예 3과 동일하게 제조하였으며, 렌즈형의 경우는 그 높이가 20㎛이고, 밑면이 지름이 40㎛인 원으로서 이러한 렌즈가 라인을 형성한 패턴인 점을 제외하고는 실시예 3과 동일하게 제조하였다.In the case of the prism type, it was manufactured in the same manner as in Example 3 except that the vertex of the top was acute, and in the case of the lenticular type, the height was 20 μm and the bottom was 40 μm in diameter. It was manufactured in the same manner as in Example 3 except that the pattern formed a line.
표 5
구분 실시예 3 plat Lens Prism
직진성(%) 15.9 66.2 64.8 25.5
평균휘도(nit) 951 938 227 894
Table 5
division Example 3 plat Lens Prism
Straightness (%) 15.9 66.2 64.8 25.5
Average luminance (nit) 951 938 227 894
상기 표 5 및 도 9를 참고하면, 실시예 3은 도광판을 출사하는 광은 광원 부근에서 휘도가 현저하게 상승하여 직진성이 우수한 것을 알 수 있으나, 다른 도광판들은 위치별 휘도 차이가 크지 않음을 알 수 있다. 특히 plat형의 경우와 렌즈형의 경우는 직진성이 매우 좋지 않음을 알 수 있다. 상기 표 5 및 도 10을 참고하면, 실시예 3은 직진성 및 휘도가 모두 우수하지만, 프리즘형은 본 발명보다 직진성 및 휘도가 모두 좋지 않고, 렌즈형 및 plat형의 도광판은 직진성 및 휘도가 가장 좋지 않음을 알 수 있다.Referring to Table 5 and FIG. 9, Example 3 shows that the light emitted from the LGP is significantly increased in the vicinity of the light source, so that the linearity of the LGP is excellent. have. In particular, in the case of the plat type and the lens type, it can be seen that the straightness is not very good. Referring to Table 5 and FIG. 10, Example 3 has both excellent linearity and brightness, but the prism type has better linearity and brightness than the present invention, and the lens type and plat type light guide plates have the best linearity and brightness. It can be seen that.

Claims (13)

  1. 프리즘 패턴이 상면에 구비되고,The prism pattern is provided on the upper surface,
    상기 프리즘은 그 수직 단면의 상단 꼭지점 부분이 호의 형상이며,The prism is in the shape of an arc at the top vertex portion of its vertical section,
    상기 수직 단면의 밑변 길이(P)는 50㎛ 내지 100 ㎛이고,Base length P of the vertical cross section is 50㎛ to 100㎛,
    상기 호의 부채꼴 중심각(θ)은 2°내지 95°이며,The arc-shaped central angle θ of the arc is 2 ° to 95 °,
    상기 수직 단면의 밑각(A)은 30° 내지 50°인 도광판.The base angle A of the vertical cross section is a light guide plate of 30 ° to 50 °.
  2. 청구항 1에 있어서, 상기 부채꼴 중심각(θ)과 상기 밑각(A)의 비가 1:0.32 내지 1:25인 도광판.The light guide plate according to claim 1, wherein the ratio of the fan-shaped center angle θ and the base angle A is 1: 0.32 to 1:25.
  3. 청구항 1에 있어서, 상기 부채꼴 중심각(θ)과 상기 밑각(A)의 비가 1:0.5 내지 1:2.5인 도광판.The light guide plate according to claim 1, wherein a ratio of the central fan angle θ and the base angle A is 1: 0.5 to 1: 2.5.
  4. 청구항 1에 있어서, 상기 밑변 길이(P)가 60㎛ 내지 80 ㎛인 도광판.     The light guide plate according to claim 1, wherein the base length P is 60 µm to 80 µm.
  5. 청구항 1에 있어서, 상기 부채꼴 중심각(θ)은 15°내지 70°인 도광판.     The light guide plate according to claim 1, wherein the sector center angle (θ) is 15 ° to 70 °.
  6. 청구항 1에 있어서, 상기 부채꼴 중심각(θ)은 16.5°내지 54.5°인 도광판.     The light guide plate according to claim 1, wherein the sector center angle (θ) is 16.5 ° to 54.5 °.
  7. 청구항 1에 있어서, 상기 밑각(A)은 35°내지 50°인 도광판.     The light guide plate of claim 1, wherein the base angle A is 35 ° to 50 °.
  8. 청구항 1에 있어서, 하면에 광산란 패턴을 갖는 도광판.     The light guide plate of Claim 1 which has a light scattering pattern in a lower surface.
  9. 청구항 8에 있어서, 상기 광산란 패턴은 음각 또는 양각인 도광판.     The light guide plate of claim 8, wherein the light scattering pattern is intaglio or embossed.
  10. 청구항 8에 있어서, 상기 광산란 패턴은 양각된 라인형 패턴으로서 그 상에 다수의 잉크 인쇄 패턴을 구비하고, 상기 잉크 인쇄 패턴은 광원이 위치하는 곳에서부터 멀어질수록 점차 조밀해지는, 도광판.    The light guide plate according to claim 8, wherein the light scattering pattern is an embossed line pattern having a plurality of ink printing patterns thereon, the ink printing pattern gradually becoming denser as the light source is located.
  11. 청구항 8에 있어서, 상기 광산란 패턴은 양각된 라인형 패턴으로서 그 상에 다수의 홈부를 구비하고, 상기 홈부는 광원이 위치하는 곳에서부터 멀어질수록 점차 조밀해지는, 도광판.    The light guide plate according to claim 8, wherein the light scattering pattern is an embossed line-shaped pattern having a plurality of grooves thereon, and the grooves become denser as the distance from the light source is located.
  12. 청구항 1 내지 11 중 어느 한 항의 도광판이 구비된 백라이트 유닛.The backlight unit provided with the light guide plate of any one of Claims 1-11.
  13. 청구항 12의 백라이트 유닛이 구비된 화상 표시 장치.     An image display device provided with the backlight unit of claim 12.
PCT/KR2012/011128 2011-12-27 2012-12-20 Light guide plate and backlight unit including same WO2013100482A1 (en)

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KR20080018329A (en) * 2006-08-24 2008-02-28 희성전자 주식회사 Lgp structure of edge-type backlight unit
KR20080067049A (en) * 2007-01-15 2008-07-18 제일모직주식회사 Light guide panel for back light unit of tft-lcd
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