WO2014007483A1 - Light guide plate and backlight unit comprising same - Google Patents

Light guide plate and backlight unit comprising same Download PDF

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Publication number
WO2014007483A1
WO2014007483A1 PCT/KR2013/005584 KR2013005584W WO2014007483A1 WO 2014007483 A1 WO2014007483 A1 WO 2014007483A1 KR 2013005584 W KR2013005584 W KR 2013005584W WO 2014007483 A1 WO2014007483 A1 WO 2014007483A1
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WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
pattern
aspect ratio
section
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PCT/KR2013/005584
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French (fr)
Korean (ko)
Inventor
이명원
금중한
정창환
Original Assignee
동우화인켐 주식회사
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Priority claimed from KR1020130072451A external-priority patent/KR20140006714A/en
Application filed by 동우화인켐 주식회사 filed Critical 동우화인켐 주식회사
Publication of WO2014007483A1 publication Critical patent/WO2014007483A1/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
    • 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

Definitions

  • the present invention relates to a light guide plate having improved brightness and linearity 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.
  • the development direction of the image display device has conventionally been the expansion of the screen, but in recent years, the expansion of the screen has become possible to the extent of exceeding the human field of view, the limit has been reached, and thus the resolution, contrast ratio, color reproducibility
  • the focus of research is to improve image quality.
  • 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 Patent Laid-Open Publication No. 2009-0112406 proposes a light guide plate having a concave portion in the lower part and a prism pattern in the upper part, but there is still a problem.
  • Patent Document 1 Korean Patent Publication No. 2009-0112406
  • An object of the present invention is to provide a light guide plate having high linearity and brightness of emitted light.
  • an object of the present invention is to provide a backlight unit having the light guide plate.
  • the aspect ratio of the lower surface pattern cross section is 0.1 to 0.3.
  • the aspect ratio of the upper surface pattern cross section is 0.2 to 0.5 light guide plate.
  • the upper linear pattern is at least one selected from the group consisting of a round-prism pattern, a triangular-prism pattern, and a lenticular pattern.
  • the backlight unit having a light guide plate of any one of the above 1 to 11.
  • the light guide plate includes a light source selected from the group consisting of a light emitting diode (LED), an organic light emitting diode (OLED), a hot cathode tube and a cold cathode tube.
  • LED light emitting diode
  • OLED organic light emitting diode
  • the backlight unit having a reflective sheet on the lower surface of the light guide plate.
  • An image display device having the backlight unit of 12 above.
  • the light guide plate of the present invention has an aspect ratio of the upper surface line pattern cross section larger than the aspect ratio of the line pattern cross section so that the light guide plate may be usefully used to implement screen division driving by improving the linearity of the emitted light.
  • 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 bottom perspective view schematically showing one embodiment of the present invention.
  • FIG. 3 is a view showing the aspect ratio of the pattern cross section according to the present invention.
  • Example 4 is a photograph of a groove formed by a laser on the surface of the embossed pattern of the round prism of Example 1 of the present invention.
  • FIG. 5 is a view showing a straightness evaluation method according to the present invention.
  • Figure 6 is a photograph taken of each sample in a test example according to the present invention.
  • Figure 7 is a graph showing the position-specific luminance measured in the test example of the present invention.
  • the present invention has a line-shaped pattern embossed on the upper surface and the lower surface, the aspect ratio (height / pitch) of the cross-sectional pattern of the upper surface pattern is equal to or greater than the aspect ratio of the cross-sectional pattern of the lower surface pattern, the closer the distance from the light source to the lower surface becomes closer.
  • FIG. 1 is a schematic bottom perspective view of one embodiment of a light guide plate of the present invention.
  • the light guide plate 100 of the present invention includes line patterns 104 and 102 embossed on the top and bottom surfaces of the substrate 101, respectively.
  • the line patterns 102 and 104 of the upper and lower surfaces of the substrate of the light guide plate 100 may have various shapes in cross-sections (hereinafter, referred to as pattern cross-sections) perpendicular to the line direction (length direction). There is no.
  • pattern cross-sections perpendicular to the line direction (length direction).
  • it may be a round-prism pattern (a), a triangular-prism pattern (b), or a lenticular pattern (c).
  • a round-prism pattern means a pattern in which the cross-sectional pattern of the pattern is a triangle having an arc shape
  • a triangle-prism pattern means a pattern in which the pattern cross-section is triangular
  • a lenticular pattern is a semicircle or It means a pattern that is semi-elliptical.
  • the aspect ratio (height / pitch) of the upper surface pattern cross section is equal to or larger than the aspect ratio of the lower surface pattern cross section, thereby solving the conventional problem.
  • the aspect ratio of the upper surface pattern cross section is 1 to 2 times the aspect ratio of the lower surface pattern cross section, the brightness and straightness of the light can be further improved.
  • the definition of the height and pitch of the pattern cross section is as shown with reference to the round-prism pattern in FIG. 3.
  • the aspect ratio (H / P) of the lower surface pattern cross section is preferably 0.1 to 0.3.
  • the aspect ratio of the lower surface of the lower surface pattern is within the above range, the brightness and the straightness of the light may be further improved.
  • the aspect ratio (H / P) of the upper surface pattern cross section is preferably 0.2 to 0.5.
  • the aspect ratio of the upper surface pattern cross section is within the above range, the brightness and the straightness of the light can be further improved.
  • the aspect ratio of the lower surface pattern cross section is 0.1 to 0.3 and the aspect ratio of the upper surface pattern cross section is 0.2 to 0.5, the brightness and straightness of the light can be further improved.
  • the cross-sectional shape of the line-shaped pattern is not particularly limited as long as the aspect ratio criteria are satisfied.
  • the upper surface line pattern 104 and the lower surface line pattern 102 may have various pattern cross sections, and for example, may be a round-prism pattern, a triangular-prism pattern, or a lenticular pattern independently of each other.
  • the upper linear pattern 104 is preferably a lenticular pattern in terms of luminance and straightness of the emitted light, and more preferably a semi-elliptic cross section in the case of the lenticular pattern.
  • the lower line pattern 102 is preferably a round-prism pattern in view of the luminance and the straightness of the emitted light.
  • the inclination angle (see FIG. 3) of the cross-prism pattern cross section is greater than 15 ° and less than 55 °, more preferably more than 20 ° If it is 55 degrees or less, the brightness and straightness of an emitted light can be improved especially notably.
  • the light guide plate 100 of the present invention includes a plurality of grooves 103 on the line-shaped pattern 102 on the bottom surface.
  • the plurality of grooves 103 may be disposed at intervals that are gradually densified in a direction away from the side where the light source is located, thereby remarkably improving the brightness and straightness of the emitted light.
  • the groove 103 is formed only in the peak portion of the pattern, but in another embodiment of the present invention, the groove portion 103 may be formed in the valley portion of the pattern, and in another embodiment, may be formed in the inclined surface of the pattern. .
  • the method of forming the groove 103 is not particularly limited as long as it is a method of forming a groove in the pattern, but it is preferable to form the groove by irradiating a laser to form a precise and uniform groove.
  • the line patterns 102 and 104 may include optically transparent resins.
  • the optical transparent resin may be a (meth) acrylic resin, polycarbonate resin, styrene resin, olefin resin, polyester resin and the like, but is not necessarily limited thereto.
  • the substrate 101 of the light guide plate of the present invention may be made of an optically transparent resin, and a resin within the same category as the patterns 102 and 104 may be used.
  • a resin within the same category as the patterns 102 and 104 may be used.
  • (meth) acrylic resins, polycarbonate resins, styrene resins, olefin resins, polyester resins, and the like may be used alone or in combination of two or more thereof, but is not limited thereto.
  • the said olefin resin it is more preferable that it is cyclic olefin resin, and it is more preferable that the said polyester resin is amorphous polyester resin.
  • methacryl-type resin it is preferable to use methacryl-type resin as said optically transparent resin.
  • the methacrylic resin include methyl methacrylate, ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, 2-ethylhexyl methacrylate, and 2-hydroxyethyl methacrylate.
  • the methacrylic resin is copolymerized with a monofunctional unsaturated monomer, and the methacrylic resin is preferably copolymerized within about 40% by weight of the monofunctional unsaturated monomer, and more preferably within about 30% by weight. Even more preferably copolymerized to within about 20% by weight.
  • Examples of the monofunctional unsaturated monomer copolymerized with the methacrylic resin include ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, 2-ethylhexyl methacrylate, and 2-hydroxy methacrylate.
  • Acrylic acid including ethyl, phenyl methacrylate, chloro methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate and the like Ester compound is preferable.
  • Examples of the monofunctional unsaturated monomer copolymerized with the methacrylic resin include unsaturated acid compounds including methacrylic acid and acrylic acid, styrene, acrylonitrile, maleic anhydride, phenyl maleimide, cyclohexyl maleimide, and the like. These can be used individually or in mixture of 2 or more types.
  • Copolymerization of the methacrylic resin with a monofunctional unsaturated monomer can be easily carried out by those skilled in the art.
  • the resin may further include one or more of a UV absorber, a bluing agent, an antioxidant, a release agent.
  • 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.
  • Such functional layers may further include one or more of ultraviolet absorbers, heat stabilizers, antioxidants, antistatic agents, fluorescent brighteners, mold release agents, and diffusing agents, and include these functional materials in the base resin or to be coated on the surface. It may be.
  • 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 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.
  • the direction of the round prism pattern 130 on the light guide plate 100 is
  • the light source 200 may be disposed at one or 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 line patterns 102 and 104 such that the light source is positioned at their ends in the longitudinal direction reduces the hot spot and is advantageous in terms of the uniformity of the emitted light. Do.
  • a reflective sheet may be further provided on the bottom surface of the light guide plate 100.
  • the reflective sheet is for reflecting light emitted from the lower portion of the light guide plate 100 to be re-incident into the light guide plate 100, and a general reflective sheet used in the art may 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.
  • Example 1-3 and Comparative Example 1-4
  • a light guide plate having a width of 716 mm was manufactured using PMMA (refractive index: 1.49), and a lenticular pattern having a semi-elliptic cross section was formed on the upper surface of the light guide plate.
  • FIG. 4 shows an optical micrograph of a groove formed by the laser of the lower surface of the light guide plate of Example 1.
  • a light source consisting of 10 million LED Rays was disposed on the side of the light guide plate, and the linearity and average 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.
  • Straightness is shown in FIG. 5, when the LED light sources of the Nth block (each block contains seven LED light sources) are turned on and the light sources of the other blocks are all off.
  • the luminance of the light emitted from the straight line connecting the light source of the N-th block is evaluated as 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 straightness exceeds 0.6%, there may be a problem that the contrast ratio is lowered at the time of local dimming, so the straightness is preferably 0.6% or less.
  • the average luminance was measured using a luminance meter (model name: BM-7, TOPCON, Japan).
  • Comparative Example 1 shows a high level of average luminance along with Example 1 in terms of luminance.
  • Comparative Example 1 is significantly lower than the Examples. This clearly shows that in the photograph shown in FIG. 6, Comparative Example 1 is significantly inferior in straightness.
  • Comparative Examples 2 to 4 can be seen that the average brightness is too low to the extent that practical use is almost impossible.
  • Example 1 Considering both luminance and straightness, it can be seen that Example 1 exhibits the most excellent effect.
  • Example 4-5 and Comparative Example 5-7 height and pitch change of the upper and lower surfaces
  • a light guide plate was manufactured in the same manner as in Example 1 except that the height and pitch were changed as shown in Table 3 below.
  • the straightness and the brightness were measured by the above-described method, and the results are shown in Table 3 below.
  • the aspect ratio of the upper surface is greater than the aspect ratio of the lower surface, it can be seen that the straightness and the brightness is excellent.
  • the aspect ratio of the lower surface is larger than the aspect ratio of the upper surface through the comparative examples 5 to 7, it can be confirmed that the straightness and luminance is lowered even if the height and pitch are changed.
  • Example 6-8 and Comparative Example 8 Change in aspect ratio of the upper surface
  • Example 1 Example 7
  • Example 8 Top surface H (um) 48 68 88 108 128
  • Top surface P (um) 300 300 300 300 300 Top aspect ratio 0.16 0.23 0.29 0.36 0.43
  • Examples 1 and 6 to 8 which are larger than the aspect ratio of the pattern cross section, have a higher linearity and brightness than the comparative example 8, when the aspect ratio is lower. .
  • Example 10-12 and Comparative Example 9 Change in aspect ratio of the lower surface
  • Example 10 Example 11
  • Example 12 Comparative Example 9 H (um) 8 10 15 20 25 P (um) 69 69 69 69 69 Aspect ratio 0.12 0.14 0.22 0.29 0.36 Top aspect ratio / bottom aspect ratio 2.50 2.00 1.33 1.00 0.80 Straightness 0.60% 0.53% 0.46% 0.54% 0.67% Luminance (nit) 835.7 852.9 857.3 851.7 814.4
  • Example 13-17 Change of the inclination angle of the lower surface
  • Example 14 Example 15 Example 1 Example 16 Example 17 Tilt angle (°) 15 25 35 45 55 58 Straightness 0.60% 0.47% 0.47% 0.46% 0.58% 0.60% Luminance (nit) 811.7 844.4 856 857.3 821.4 813.3
  • Examples 14 to 16 which have a preferred inclination angle range of the present invention, exhibit remarkable straightness and luminance.

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Abstract

The present invention relates to a light guide plate and a backlight unit having the same and, more specifically, to a light guide plate which has improved luminance and linearity of emitted light by having linear patterns embossed on upper and lower surfaces of the light guide plate, an aspect ratio (height/pitch) of the upper portion which is equal to or greater than the aspect ratio of the lower surface pattern, and a plurality of grooves of which the space therebetween becomes smaller as the distance from a light sources increases on the lower surface of the light guide plate, and a backlight unit having the same.

Description

도광판 및 이를 포함하는 백라이트 유닛Light guide plate and backlight unit including the same
본 발명은 출사되는 광의 휘도 및 직진성이 개선된 도광판 및 이를 포함하는 백라이트 유닛에 관한 것이다.The present invention relates to a light guide plate having improved brightness and linearity 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 종래에는 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 has conventionally been the expansion of the screen, but in recent years, the expansion of the screen has become possible to the extent of exceeding the human field of view, the limit has been reached, and thus the resolution, contrast ratio, color reproducibility The focus of research is to improve image 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, 한국공개특허 제2009-0112406호는 하부에 고랑 형상의 오목부와 상부에 프리즘 패턴을 구비한 도광판을 제안하고 있으나, 여전히 부족한 문제점이 있었다.In this regard, Korean Patent Laid-Open Publication No. 2009-0112406 proposes a light guide plate having a concave portion in the lower part and a prism pattern in the upper part, but there is still a problem.
[선행기술문헌][Preceding technical literature]
[특허문헌][Patent Documents]
(특허문헌 1) 특허문헌 1: 한국공개특허 제2009-0112406호(Patent Document 1) Patent Document 1: Korean Patent Publication No. 2009-0112406
본 발명은 출사되는 광의 직진성 및 휘도가 높은 도광판을 제공하는 것을 목적으로 한다.An object of the present invention is to provide a light guide plate having high 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. 상면과 하면에 양각된 라인형 패턴을 가지며 상기 상면 패턴 단면의 종횡비(높이/피치)가 상기 하면 패턴 단면의 종횡비보다 같거나 크고, 상기 하면에 광원으로부터 멀어질수록 그 간격이 조밀해지는 다수의 홈부를 구비하는 도광판.1. A plurality of lines having embossed line patterns on the upper and lower surfaces and having an aspect ratio (height / pitch) of the cross section of the upper surface pattern being the same as or greater than the aspect ratio of the cross section of the lower surface pattern, the closer the distance is from the light source to the lower surface. A light guide plate having a groove portion.
*2. 위 1에 있어서, 상기 하면 패턴 단면의 종횡비는 0.1 내지 0.3인 도광판.*2. In the above 1, the aspect ratio of the lower surface pattern cross section is 0.1 to 0.3.
3. 위 1에 있어서, 상기 상면 패턴 단면의 종횡비는 0.2 내지 0.5인 도광판.3. In the above 1, the aspect ratio of the upper surface pattern cross section is 0.2 to 0.5 light guide plate.
4. 위 1에 있어서, 상기 하면 패턴 단면의 종횡비는 0.1 내지 0.3이고 상기 상면 패턴 단면의 종횡비는 0.2 내지 0.5인 도광판.4. The light guide plate of 1 above, wherein the aspect ratio of the lower surface pattern cross section is 0.1 to 0.3 and the aspect ratio of the upper surface pattern cross section is 0.2 to 0.5.
5. 위 1에 있어서, 상기 상면 패턴 단면의 종횡비는 상기 하면 패턴 단면의 종횡비의 1배 내지 2배인 도광판.5. The light guide plate of 1 above, wherein the aspect ratio of the upper surface pattern cross section is 1 to 2 times the aspect ratio of the lower surface pattern cross section.
6. 위 1에 있어서, 상기 하면의 라인형 패턴은 라운드-프리즘 패턴, 삼각-프리즘 패턴 및 렌티큘러 패턴으로 이루어진 군에서 선택되는 적어도 하나인 도광판.6. The light guide plate of 1 above, wherein the line-shaped pattern of the lower surface is at least one selected from the group consisting of a round-prism pattern, a triangular-prism pattern, and a lenticular pattern.
7. 위 1에 있어서, 상기 하면의 라인형 패턴은 라운드-프리즘 패턴인 도광판.7. The light guide plate of 1 above, wherein the line-shaped pattern of the lower surface is a round-prism pattern.
8. 위 7에 있어서, 상기 하면 라운드-프리즘 패턴 단면의 경사각은 15°초과 내지 55°이하인 도광판.8. The light guide plate of 7 above, wherein the inclination angle of the round-prism pattern cross section is greater than 15 ° and less than 55 °.
9. 위 1에 있어서, 상기 홈부는 레이저를 조사하여 형성된 것인 도광판.9. The light guide plate of claim 1, wherein the groove is formed by irradiating a laser.
10. 위 1에 있어서, 상기 상면의 라인형 패턴은 라운드-프리즘 패턴, 삼각-프리즘 패턴 및 렌티큘러 패턴으로 이루어진 군에서 선택되는 적어도 하나인 도광판.10. The light guide plate of 1 above, wherein the upper linear pattern is at least one selected from the group consisting of a round-prism pattern, a triangular-prism pattern, and a lenticular pattern.
11. 위 1에 있어서, 상기 상면의 라인형 패턴은 렌티큘러 패턴인 도광판.11. The light guide plate of 1 above, wherein the upper linear pattern is a lenticular pattern.
12. 위 1 내지 11 중 어느 한 항의 도광판을 구비하는 백라이트 유닛.12. The backlight unit having a light guide plate of any one of the above 1 to 11.
13. 위 12에 있어서, 상기 도광판의 측면에 발광 다이오드(LED), 유기발광 다이오드(OLED), 열음극관 및 냉음극관으로 이루어진 군에서 선택된 광원을 포함하는 백라이트 유닛.13. The backlight unit of claim 12, wherein the light guide plate includes a light source selected from the group consisting of a light emitting diode (LED), an organic light emitting diode (OLED), a hot cathode tube and a cold cathode tube.
14. 위 12에 있어서, 상기 도광판의 하면에 반사 시트를 구비하는 백라이트 유닛.14. In the above 12, the backlight unit having a reflective sheet on the lower surface of the light guide plate.
15. 위 12의 백라이트 유닛을 구비하는 화상 표시 장치.15. An image display device having the backlight unit of 12 above.
본 발명의 도광판은 상면 라인형 패턴 단면의 종횡비를 하면 라인형 패턴 단면의 종횡비보다 크게 구비함으로써, 출사되는 광의 직진성을 향상시켜 화면 분할 구동을 구현하는데 유용하게 사용될 수 있다.The light guide plate of the present invention has an aspect ratio of the upper surface line pattern cross section larger than the aspect ratio of the line pattern cross section so that the light guide plate may be usefully used to implement screen division driving by improving the linearity of the emitted light.
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 일 구현예를 개략적으로 도시한 하부 사시도이다.1 is a bottom perspective view schematically showing one embodiment of the present invention.
도 2는 본 발명의 하면 라인형 패턴의 예시들의 각 단면을 나타낸 도면이다.2 is a cross-sectional view of each of the examples of the lower surface line pattern of the present invention.
도 3은 본 발명에 따른 패턴 단면의 종횡비를 나타낸 도면이다.3 is a view showing the aspect ratio of the pattern cross section according to the present invention.
도 4는 본 발명의 실시예 1의 라운드 프리즘 양각 패턴 표면에 레이저로 형성된 홈부를 촬영한 사진이다.4 is a photograph of a groove formed by a laser on the surface of the embossed pattern of the round prism of Example 1 of the present invention.
도 5는 본 발명에 따른 직진성 평가방법을 나타낸 도면이다.5 is a view showing a straightness evaluation method according to the present invention.
도 6은 본 발명에 따른 시험예에서 각 시료들을 촬영한 사진이다.Figure 6 is a photograph taken of each sample in a test example according to the present invention.
도 7은 본 발명의 시험예에서 측정된 위치별 휘도를 나타낸 그래프이다.Figure 7 is a graph showing the position-specific luminance measured in the test example of the present invention.
도 8은 본 발명의 시험예에서 측정된 직진성 및 평균휘도를 나타낸 그래프이다.8 is a graph showing the linearity and average luminance measured in the test example of the present invention.
본 발명은 상면과 하면에 양각된 라인형 패턴을 가지며 상기 상면 패턴 단면의 종횡비(높이/피치)가 상기 하면 패턴 단면의 종횡비보다 같거나 크고, 상기 하면에 광원으로부터 멀어질수록 그 간격이 조밀해지는 다수의 홈부를 구비함으로써, 출사되는 광의 휘도 및 직진성이 향상된 도광판 및 이를 구비하는 백라이트 유닛에 관한 것이다.The present invention has a line-shaped pattern embossed on the upper surface and the lower surface, the aspect ratio (height / pitch) of the cross-sectional pattern of the upper surface pattern is equal to or greater than the aspect ratio of the cross-sectional pattern of the lower surface pattern, the closer the distance from the light source to the lower surface becomes closer By providing a plurality of grooves, and relates to a light guide plate having improved brightness and straightness of the emitted light and a backlight unit having the same.
이하, 도면을 참조하여 본 발명을 상세하게 설명하도록 한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
도 1에는 본 발명의 도광판의 일 구현예의 개략적인 하부 사시도가 도시되어 있다.1 is a schematic bottom perspective view of one embodiment of a light guide plate of the present invention.
본 발명의 도광판(100)은 기재(101)의 상면과 하면에 각각 양각된 라인형 패턴(104, 102)를 구비한다.The light guide plate 100 of the present invention includes line patterns 104 and 102 embossed on the top and bottom surfaces of the substrate 101, respectively.
도광판(100)의 기재 상면과 하면의 라인형 패턴(102, 104)은 라인 방향(길이 방향)에 수직인 방향의 단면(이하, 패턴 단면)이 다양한 형태를 가질 수 있으며, 그 형태에 특별한 제한은 없다. 예를 들면, 도 2에 도광판 하면을 기준으로 도시된 바와 같이, 라운드-프리즘 패턴(a), 삼각-프리즘 패턴(b) 또는 렌티큘러 패턴(c)일 수 있다. 라운드-프리즘 패턴이란 패턴 단면 형태가 상단 꼭지점 부분이 호의 형태를 갖는 삼각형인 패턴을 의미하며, 삼각-프리즘 패턴이란 패턴 단면 형태가 삼각형인 패턴을 의미하며, 렌티큘러 패턴이란 패턴 단면의 형태가 반원형 또는 반타원형인 패턴을 의미한다.The line patterns 102 and 104 of the upper and lower surfaces of the substrate of the light guide plate 100 may have various shapes in cross-sections (hereinafter, referred to as pattern cross-sections) perpendicular to the line direction (length direction). There is no. For example, as shown with reference to the lower surface of the light guide plate in FIG. 2, it may be a round-prism pattern (a), a triangular-prism pattern (b), or a lenticular pattern (c). A round-prism pattern means a pattern in which the cross-sectional pattern of the pattern is a triangle having an arc shape, and a triangle-prism pattern means a pattern in which the pattern cross-section is triangular, and a lenticular pattern is a semicircle or It means a pattern that is semi-elliptical.
종래 다양한 패턴을 갖는 도광판이 소개되었으나, 출사되는 광의 휘도 및 직진성이 당 분야에서 요구되는 수준을 충족시키지 못하였다. 이에 본 발명의 도광판(100)은 상면 패턴 단면의 종횡비(높이/피치)가 상기 하면 패턴 단면의 종횡비보다 같거나 크게 함으로써, 종래의 문제점을 해결하였다. 바람직하게는 상면 패턴 단면의 종횡비가 상기 하면 패턴 단면의 종횡비의 1배 내지 2배인 경우에 광의 휘도 및 직진성을 더욱 향상시킬 수 있다.Although a light guide plate having various patterns has been introduced in the related art, luminance and straightness of the emitted light did not satisfy a level required in the art. In the light guide plate 100 of the present invention, the aspect ratio (height / pitch) of the upper surface pattern cross section is equal to or larger than the aspect ratio of the lower surface pattern cross section, thereby solving the conventional problem. Preferably, when the aspect ratio of the upper surface pattern cross section is 1 to 2 times the aspect ratio of the lower surface pattern cross section, the brightness and straightness of the light can be further improved.
본 발명에 있어서 패턴 단면의 높이 및 피치의 정의는 도 3에 라운드-프리즘 패턴을 기준으로 도시된 바와 같다.In the present invention, the definition of the height and pitch of the pattern cross section is as shown with reference to the round-prism pattern in FIG. 3.
본 발명의 일 구현예에 있어서, 하면 패턴 단면의 종횡비(H/P)는 0.1 내지 0.3인 것이 바람직하다. 하면 패턴 단면의 종횡비가 상기 범위인 경우 광의 휘도 및 직진성을 더욱 향상시킬 수 있다.In one embodiment of the present invention, the aspect ratio (H / P) of the lower surface pattern cross section is preferably 0.1 to 0.3. When the aspect ratio of the lower surface of the lower surface pattern is within the above range, the brightness and the straightness of the light may be further improved.
본 발명의 다른 일 구현예에 있어서, 상기 상면 패턴 단면의 종횡비(H/P)는 0.2 내지 0.5인 것이 바람직하다. 상면 패턴 단면의 종횡비가 상기 범위인 경우 광의 휘도 및 직진성을 더욱 향상시킬 수 있다.In another embodiment of the present invention, the aspect ratio (H / P) of the upper surface pattern cross section is preferably 0.2 to 0.5. When the aspect ratio of the upper surface pattern cross section is within the above range, the brightness and the straightness of the light can be further improved.
보다 바람직하게는, 하면 패턴 단면의 종횡비는 0.1 내지 0.3이고 상면 패턴 단면의 종횡비는 0.2 내지 0.5인 경우에 광의 휘도 및 직진성을 더욱 더 향상시킬 수 있다.More preferably, when the aspect ratio of the lower surface pattern cross section is 0.1 to 0.3 and the aspect ratio of the upper surface pattern cross section is 0.2 to 0.5, the brightness and straightness of the light can be further improved.
본 발명에 있어서, 상기와 같은 종횡비 기준을 만족한다면 라인형 패턴의 단면 형태에는 특별한 제한은 없다. 따라서, 상면 라인형 패턴(104) 및 하면 라인형 패턴(102)는 각각 다양한 패턴 단면을 가질 수 있으며, 예를 들면, 서로 독립적으로 라운드-프리즘 패턴, 삼각-프리즘 패턴 또는 렌티큘러 패턴일 수 있다.In the present invention, the cross-sectional shape of the line-shaped pattern is not particularly limited as long as the aspect ratio criteria are satisfied. Accordingly, the upper surface line pattern 104 and the lower surface line pattern 102 may have various pattern cross sections, and for example, may be a round-prism pattern, a triangular-prism pattern, or a lenticular pattern independently of each other.
상면 라인형 패턴(104)은 렌티큘러 패턴인 것이 출사광의 휘도 및 직진성 측면에서 바람직하고, 렌티큘러 패턴인 경우에는 단면이 반타원형인 것이 보다 바람직하다.The upper linear pattern 104 is preferably a lenticular pattern in terms of luminance and straightness of the emitted light, and more preferably a semi-elliptic cross section in the case of the lenticular pattern.
하면 라인형 패턴(102)은 라운드-프리즘 패턴인 것이 출사광의 휘도 및 직진성 측면에서 보다 바람직하다. 본 발명에 있어서, 하면 라인형 패턴(102)은 라운드-프리즘 패턴인 경우에는, 라운드-프리즘 패턴 단면의 경사각(도 3 참조)이 15°초과 내지 55°이하, 보다 바람직하게는 20° 초과 내지 55°이하이면 출사광의 휘도 및 직진성을 특히 현저하게 향상시킬 수 있다.The lower line pattern 102 is preferably a round-prism pattern in view of the luminance and the straightness of the emitted light. In the present invention, when the bottom line pattern 102 is a round-prism pattern, the inclination angle (see FIG. 3) of the cross-prism pattern cross section is greater than 15 ° and less than 55 °, more preferably more than 20 ° If it is 55 degrees or less, the brightness and straightness of an emitted light can be improved especially notably.
또한, 본 발명의 도광판(100)은 하면의 라인형 패턴(102) 상에 다수의 홈부(103)를 구비한다. 다수의 홈부(103)는 광원이 위치하는 측에서부터 멀어지는 방향으로 점차 조밀해지는 간격으로 배치됨으로써 출사되는 광의 휘도 및 직진성을 현저하게 향상시킬 수 있다.In addition, the light guide plate 100 of the present invention includes a plurality of grooves 103 on the line-shaped pattern 102 on the bottom surface. The plurality of grooves 103 may be disposed at intervals that are gradually densified in a direction away from the side where the light source is located, thereby remarkably improving the brightness and straightness of the emitted light.
홈부(103)가 형성되는 위치에는 특별한 제한이 없다. 도 1에는 홈부(103)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 103 is formed. 1 illustrates an embodiment in which the groove 103 is formed only in the peak portion of the pattern, but in another embodiment of the present invention, the groove portion 103 may be formed in the valley portion of the pattern, and in another embodiment, may be formed in the inclined surface of the pattern. .
홈부(103)의 형성 방법은 패턴에 홈을 형성할 수 있는 방법이라면 특별한 제한은 없으나, 정밀하고 균일한 홈부의 형성을 위해서는 레이저를 조사하여 형성하는 것이 바람직하다.The method of forming the groove 103 is not particularly limited as long as it is a method of forming a groove in the pattern, but it is preferable to form the groove by irradiating a laser to form a precise and uniform groove.
라인형 패턴(102, 104)은 광학적 투명수지를 포함할 수 있다. 상기 광학적 투명 수지는 (메타)아크릴계 수지, 폴리카보네이트계 수지, 스티렌계 수지, 올레핀계 수지, 폴리에스테르계 수지 등이 사용될 수 있으며, 반드시 이에 제한되는 것은 아니다.The line patterns 102 and 104 may include optically transparent resins. The optical transparent resin may be a (meth) acrylic resin, polycarbonate resin, styrene resin, olefin resin, polyester resin and the like, but is not necessarily limited thereto.
본 발명의 도광판의 기재(101)는 광학적 투명수지로 이루어질 수 있으며, 패턴(102, 104)와 동일한 범주 내의 수지가 사용될 수 있다. 예를 들면, (메타)아크릴계 수지, 폴리 카보네이트계 수지, 스티렌계 수지, 올레핀계 수지, 폴리에스테르계 수지 등이 각각 단독으로 또는 2종 이상 혼합되어 사용될 수 있으나, 이에 한정되는 것은 아니다.The substrate 101 of the light guide plate of the present invention may be made of an optically transparent resin, and a resin within the same category as the patterns 102 and 104 may be used. For example, (meth) acrylic resins, polycarbonate resins, styrene resins, olefin resins, polyester resins, and the like may be used alone or in combination of two or more thereof, but is not limited thereto.
상기 올레핀계 수지는 환형 올레핀계 수지인 것이 보다 바람직하고, 상기 폴리에스테르계 수지는 비정질 폴리에 스테르계 수지인 것이 보다 바람직하다.As for the said olefin resin, it is more preferable that it is cyclic olefin resin, and it is more preferable that the said polyester resin is amorphous polyester resin.
상기 광학적 투명 수지로는 메타크릴계 수지를 사용하는 것이 바람직하다. 상기 메타크릴계 수지로는 메타 크릴산 메틸, 메타크릴산 에틸, 메타크릴산 부틸, 메타크릴산 시클로 헥실, 메타크릴산 벤질, 메타크릴산 2-에 틸 헥실, 메타크릴산 2-히드록시 에틸, 메타크릴산 페닐, 메타크릴산 클로로 페닐 등이 있으며, 이 중 투과율이 높은 메타크릴산 메틸계 수지가 보다 바람직하다.It is preferable to use methacryl-type resin as said optically transparent resin. Examples of the methacrylic resin include methyl methacrylate, ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, 2-ethylhexyl methacrylate, and 2-hydroxyethyl methacrylate. And phenyl methacrylate, chloro methacrylate, and the like, of which methyl methacrylate resin having a high transmittance is more preferable.
상기 메타크릴계 수지는 단관능 불포화 단량체와 공중합된 것이 더욱 바람직하고, 상기 메타크릴계 수지는 단관능 불포화 단량체와 약 40 중량% 이내로 공중합되는 것이 바람직하고, 약 30 중량% 이내로 공중합되는 것이 더욱 바람직하고, 약 20 중량% 이내로 공중합되는 것이 더더욱 바람직하다.More preferably, the methacrylic resin is copolymerized with a monofunctional unsaturated monomer, and the methacrylic resin is preferably copolymerized within about 40% by weight of the monofunctional unsaturated monomer, and more preferably within about 30% by weight. Even more preferably copolymerized to within about 20% by weight.
상기 메타크릴계 수지에 공중합되는 단관능 불포화 단량체로는 메타크릴산 에틸, 메타크릴산 부틸, 메타크릴산 시클로 헥실, 메타크릴산 벤질, 메타크릴산 2-에틸 헥실, 메타크릴산 2-히드록시 에틸, 메타크릴산 페닐, 메타크릴산 클로로 페닐, 아크릴산 메틸, 아크릴산 에틸, 아크릴산 부틸, 아크릴산 시클로 헥실, 아크릴산 페닐, 아크릴산 벤질, 아크릴산 2-에틸 헥실, 및 아크릴산 2-히드록시 에틸 등을 포함하는 아크릴산 에스테르계 화합물이 바람직하다.Examples of the monofunctional unsaturated monomer copolymerized with the methacrylic resin include ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, 2-ethylhexyl methacrylate, and 2-hydroxy methacrylate. Acrylic acid including ethyl, phenyl methacrylate, chloro methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate and the like Ester compound is preferable.
상기 메타크릴계 수지에 공중합되는 단관능 불포화 단량체로는 메타크릴산 및 아크릴산 등을 포함하는 불포화 산 화합물, 스티렌, 아크릴로 니트릴, 무수 말레산, 페닐 말레이미드, 시클로 헥실 말레이미드 등이 있다. 이들은 단독 또는 2종 이상 혼합하여 사용될 수 있다.Examples of the monofunctional unsaturated monomer copolymerized with the methacrylic resin include unsaturated acid compounds including methacrylic acid and acrylic acid, styrene, acrylonitrile, maleic anhydride, phenyl maleimide, cyclohexyl maleimide, and the like. These can be used individually or in mixture of 2 or more types.
상기 메타크릴계 수지와 단관능 불포화 단량체를 공중합시키는 것은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의하여 용이하게 실시될 수 있다.Copolymerization of the methacrylic resin with a monofunctional unsaturated monomer can be easily carried out by those skilled in the art.
또한, 상기 수지에는 자외선 흡수제, 블루잉제, 산화방지제, 이형제 중 하나 이상이 더 포함될 수 있다.In addition, the resin may further include one or more of a UV absorber, a bluing agent, an antioxidant, a release agent.
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, 확산제 중 하나 이상을 더 포함할 수 있으며, 베이스 수지에 이들 기능성 물질을 포함시키거나 표면에 코팅시킬 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. Such functional layers may further include one or more of ultraviolet absorbers, heat stabilizers, antioxidants, antistatic agents, fluorescent brighteners, mold release agents, and diffusing agents, and include these functional materials in the base resin or to be coated on the surface. It may be.
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. 광원이 도광판의 측면에 대향하여 위치하는 엣지형 백라이트 유닛이 바람직하나, 별도의 반사 수단이 도광판의 측면으로 적절히 광을 입사시킬 수 있다면 광원이 다른 곳에 위치하여도 무방하다. 광원은 예컨대 발광 다이오드(LED), 유기 발광 다이오드(OLED), 열음극관, 냉음극관 등을 제한 없이 사용할 수 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. 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 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 1에 도시한 바와 같이, 광원(200)이 도광판(100)의 측면에 위치할 경우에, 도광판(100) 상부의 라운드 프리즘 패턴(130)의 방향은 그 길이방향으로 한쪽 또는 양 말단에 광원(200)이 위치하도록 배치되거나, 상기 방향과는 수직인 위치에 광원(200)이 위치하도록 배치될 수 있다. 바람직하게는 도 2에 개략적으로 도시된 바와 같이, 라인형 패턴(102, 104)의 방향이 그 길이방향으로 그 말단에 광원이 위치하도록 배치되는 것이 핫스팟을 감소시키고 출사되는 광의 균일성 측면에서 유리하다. In the backlight unit according to the present invention, as shown in FIG. 1, 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 one or 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. Preferably, as schematically shown in FIG. 2, the arrangement of the line patterns 102 and 104 such that the light source is positioned at their ends in the longitudinal direction reduces the hot spot and is advantageous in terms of the uniformity of the emitted light. Do.
또한, 도광판(100)의 하면에는 반사 시트가 추가로 구비될 수 있다. 반사 시트는 도광판(100)의 하부로 출사되는 광을 반사시켜 도광판(100) 내부로 재입사시키기 위한 것으로서, 본 기술분야에서 사용되는 일반적인 반사 시트가 제한 없이 사용될 수 있다.In addition, a reflective sheet may be further provided on the bottom surface of the light guide plate 100. The reflective sheet is for reflecting light emitted from the lower portion of the light guide plate 100 to be re-incident into the light guide plate 100, and a general reflective sheet used in the art may 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.
이하, 본 발명의 이해를 돕기 위하여 바람직한 실시예를 제시하나, 이들 실시예는 본 발명을 예시하는 것일 뿐 첨부된 특허청구범위를 제한하는 것이 아니며, 본 발명의 범주 및 기술사상 범위 내에서 실시예에 대한 다양한 변경 및 수정이 가능함은 당업자에게 있어서 명백한 것이며, 이러한 변형 및 수정이 첨부된 특허청구범위에 속하는 것도 당연한 것이다. Hereinafter, preferred examples are provided to aid the understanding of the present invention, but these examples are merely illustrative of the present invention and are not intended to limit the scope of the appended claims, which are within the scope and spirit of the present invention. It is apparent to those skilled in the art that various changes and modifications can be made to the present invention, and such modifications and changes belong to the appended claims.
실시예 1-3 및 비교예 1-4Example 1-3 and Comparative Example 1-4
PMMA(굴절률: 1.49)로 폭이 716mm인 도광판을 제조하였으며, 도광판 상면에는 단면이 반타원형인 렌티큘러 패턴을 형성하였다. 도광판 하면에는 하기 표 1에 기재된 바와 같이 라인형 패턴을 형성하고, 광원이 위치하게 되는 방향에서부터 광원에서 멀어지는 방향으로 간격이 조밀하도록 레이저로 홈부를 형성하였다(모든 도광판의 패턴 단면 상면 종횡비는 0.29, 하면 종횡비는 0.22, 하면 경사각 = 45 °).A light guide plate having a width of 716 mm was manufactured using PMMA (refractive index: 1.49), and a lenticular pattern having a semi-elliptic cross section was formed on the upper surface of the light guide plate. On the lower surface of the light guide plate, as shown in Table 1, a line-shaped pattern was formed, and grooves were formed with a laser so as to close the gap in the direction away from the light source from the direction in which the light source is located (the aspect ratio of the upper surface of the pattern section of all the light guide plates was 0.29, The bottom aspect ratio is 0.22, and the bottom slope angle = 45 °).
참고로, 도 4에 실시예 1의 도광판 하면의 레이저로 형성된 홈부의 광학 현미경 사진을 나타내었다.For reference, FIG. 4 shows an optical micrograph of a groove formed by the laser of the lower surface of the light guide plate of Example 1. FIG.
표 1
실시예1 실시예2 실시예3 비교예1 비교예2 비교예3 비교예4
상면 패턴 단면 렌티큘러 렌티큘러 렌티큘러 렌티큘러 렌티큘러 렌티큘러 렌티큘러
하면 패턴 단면 라운드 프리즘 삼각 프리즘 렌티큘러 - 라운드 프리즘 삼각 프리즘 렌티큘러
홈부 형성 ○ ○ ○ ○ × × ×
Table 1
Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4
Top pattern cross section Lenticular Lenticular Lenticular Lenticular Lenticular Lenticular Lenticular
Pattern cross section Round prism Triangular prism Lenticular - Round prism Triangular prism Lenticular
Groove formation ○ ○ ○ ○ × × ×
시험예 Test Example
상기 제조된 도광판 측면에 LED Ray 1,000만개로 이루어진 광원을 배치하고 LED 광출사각 120°, LED 광세기 35 lumen의 조건으로 도광판에서 출사되는 광의 직진성 및 평균휘도를 측정하였다.A light source consisting of 10 million LED Rays was disposed on the side of the light guide plate, and the linearity and average 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 5에 개략적으로 도시된 바와 같이, N번째 블록의 LED 광원들(각 블록은 LED 광원을 7개 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. 다만, 직진성이 0.6%을 초과하면 로컬 디밍 시에 명암비가 저하되는 문제가 발생할 수 있으므로, 직진성은 0.6% 이하인 것이 바람직하다.Straightness is shown in FIG. 5, when the LED light sources of the Nth block (each block contains seven LED light sources) are turned on and the light sources of the other blocks are all off. The luminance of the light emitted from the straight line connecting the light source of the N-th block is evaluated as 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. However, if the straightness exceeds 0.6%, there may be a problem that the contrast ratio is lowered at the time of local dimming, so the straightness is preferably 0.6% or less.
평균휘도는 휘도계(모델명: BM-7, 일본 TOPCON사)를 사용하여 휘도를 측정하였다.The average luminance was measured using a luminance meter (model name: BM-7, TOPCON, Japan).
상기 측정 결과를 하기 표 2 및 도 6(촬영 사진), 도 7(위치별 휘도)와 도 8(직진성 및 평균휘도)에 도시하였다.The measurement results are shown in Table 2 and FIG. 6 (photographed photo), FIG. 7 (luminance at each position) and FIG. 8 (straightness and average luminance).
표 2
구분 실시예1 실시예2 실시예3 비교예1 비교예2 비교예3 비교예4
직진성(%)(n+3위치) 0.46 0.51 0.54 1.95 0.78 0.90 0.86
평균휘도(nit) 857.3 800.3 672.3 857.4 267.8 213.2 127.5
TABLE 2
division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4
Straightness (%) (n + 3 position) 0.46 0.51 0.54 1.95 0.78 0.90 0.86
Average luminance (nit) 857.3 800.3 672.3 857.4 267.8 213.2 127.5
상기 표 2 및 도 6, 도 7, 도 8을 참고하면, 휘도 측면에서는 비교예 1이 실시예 1과 함께 높은 수준의 평균휘도를 나타내는 것을 알 수 있다.Referring to Table 2 and FIGS. 6, 7 and 8, it can be seen that Comparative Example 1 shows a high level of average luminance along with Example 1 in terms of luminance.
하지만, 직진성 측면에서는 비교예 1이 실시예들에 비해 현저하게 저하되는 것을 확인할 수 있다. 이는 도 6에 나타난 사진에서도 비교예1이 직진성이 현저하게 떨어지는 것을 분명하게 나타난다.However, in terms of straightness, it can be seen that Comparative Example 1 is significantly lower than the Examples. This clearly shows that in the photograph shown in FIG. 6, Comparative Example 1 is significantly inferior in straightness.
또한, 비교예 2 내지 4는 실제 사용이 거의 불가능한 정도로 평균휘도가 너무 낮은 것을 알 수 있다.In addition, Comparative Examples 2 to 4 can be seen that the average brightness is too low to the extent that practical use is almost impossible.
휘도와 직진성을 모두 고려하면, 실시예1이 가장 우수한 효과를 나타내는 것을 알 수 있다.Considering both luminance and straightness, it can be seen that Example 1 exhibits the most excellent effect.
실시예 4-5 및 비교예 5-7 : 상면 및 하면의 높이 및 피치 변화Example 4-5 and Comparative Example 5-7: height and pitch change of the upper and lower surfaces
높이와 피치를 하기 표 3과 같이 변화시킨 것을 제외하고는 실시예 1과 동일하게 도광판을 제조하였고, 전술한 방법으로 직진성과 휘도를 측정하여 그 결과를 하기 표 3에 기재하였다.A light guide plate was manufactured in the same manner as in Example 1 except that the height and pitch were changed as shown in Table 3 below. The straightness and the brightness were measured by the above-described method, and the results are shown in Table 3 below.
표 3
실시예 1 실시예 4 실시예 5 비교예 5 비교예 6 비교예 7
상면 H/P(um) 88/300 78/266 68/232 5/23 10/46 15/69
하면 H/P(um) 15/69 10/46 5/23 68/232 78/266 88/300
상면 종횡비 0.29 0.29 0.29 0.22 0.22 0.22
하면 종횡비 0.22 0.22 0.22 0.29 0.29 0.29
직진성 0.46% 0.49% 0.51% 0.68% 0.73% 0.74%
휘도(nit) 857.3 849.6 845.1 799.1 795.5 789.8
TABLE 3
Example 1 Example 4 Example 5 Comparative Example 5 Comparative Example 6 Comparative Example 7
Top surface H / P (um) 88/300 78/266 68/232 5/23 10/46 15/69
H / P (um) 15/69 10/46 5/23 68/232 78/266 88/300
Top aspect ratio 0.29 0.29 0.29 0.22 0.22 0.22
Aspect ratio 0.22 0.22 0.22 0.29 0.29 0.29
Straightness 0.46% 0.49% 0.51% 0.68% 0.73% 0.74%
Luminance (nit) 857.3 849.6 845.1 799.1 795.5 789.8
표 3을 참고하면, 높이와 피치를 변화시키더라도 상면의 종횡비가 하면의 종횡비보다 크다면 직진성과 휘도가 우수한 것을 확인할 수 있다.Referring to Table 3, even if the height and pitch are changed, the aspect ratio of the upper surface is greater than the aspect ratio of the lower surface, it can be seen that the straightness and the brightness is excellent.
그러나, 비교예 5 내지 7을 통하여 하면의 종횡비가 상면의 종횡비보다 크다면 높이와 피치를 변화시키더라도 직진성과 휘도가 저하되는 것을 확인할 수 있다.However, if the aspect ratio of the lower surface is larger than the aspect ratio of the upper surface through the comparative examples 5 to 7, it can be confirmed that the straightness and luminance is lowered even if the height and pitch are changed.
실시예 6-8 및 비교예 8 : 상면의 종횡비 변화Example 6-8 and Comparative Example 8: Change in aspect ratio of the upper surface
하면의 종횡비(15/69 = 0.22)를 고정하고 상면의 종횡비를 하기 표 4와 같이 변화시킨 것을 제외하고는 실시예 1과 동일하게 도광판을 제조하였고, 전술한 방법으로 직진성과 휘도를 측정하여 그 결과를 하기 표 4에 기재하였다.A light guide plate was manufactured in the same manner as in Example 1 except that the aspect ratio of the lower surface (15/69 = 0.22) was fixed and the aspect ratio of the upper surface was changed as shown in Table 4 below. The results are shown in Table 4 below.
표 4
비교예 8 실시예 6 실시예 1 실시예 7 실시예 8
상면 H(um) 48 68 88 108 128
상면 P(um) 300 300 300 300 300
상면 종횡비 0.16 0.23 0.29 0.36 0.43
상면종횡비/하면종횡비 0.73 1.03 1.33 1.64 1.94
직진성 0.63% 0.52% 0.46% 0.44% 0.43%
휘도(nit) 798.5 845.8 857.3 859.9 860.2
Table 4
Comparative Example 8 Example 6 Example 1 Example 7 Example 8
Top surface H (um) 48 68 88 108 128
Top surface P (um) 300 300 300 300 300
Top aspect ratio 0.16 0.23 0.29 0.36 0.43
Top aspect ratio / bottom aspect ratio 0.73 1.03 1.33 1.64 1.94
Straightness 0.63% 0.52% 0.46% 0.44% 0.43%
Luminance (nit) 798.5 845.8 857.3 859.9 860.2
표 4를 참고하면, 상면 패턴 단면이 다양한 높이와 피치를 갖더라도 그 종횡비가 하면 패턴 단면의 종횡비보다 큰 실시예 1 및 6 내지 8이 그렇지 않은 비교예 8보다 직진성과 휘도가 우수한 것을 확인할 수 있다.Referring to Table 4, it can be seen that even if the upper surface pattern cross section has various heights and pitches, Examples 1 and 6 to 8, which are larger than the aspect ratio of the pattern cross section, have a higher linearity and brightness than the comparative example 8, when the aspect ratio is lower. .
실시예 10-12 및 비교예 9 : 하면의 종횡비 변화Example 10-12 and Comparative Example 9: Change in aspect ratio of the lower surface
상면의 종횡비(88/300 = 0.29)를 고정하고 하면의 종횡비를 하기 표 5와 같이 변화시킨 것을 제외하고는 실시예 1과 동일하게 도광판을 제조하였고, 전술한 방법으로 직진성과 휘도를 측정하여 그 결과를 하기 표 5에 기재하였다.The light guide plate was manufactured in the same manner as in Example 1 except that the aspect ratio of the upper surface (88/300 = 0.29) was fixed and the aspect ratio of the lower surface was changed as shown in Table 5 below. The results are shown in Table 5 below.
표 5
실시예 10 실시예 11 실시예 1 실시예 12 비교예 9
하면 H(um) 8 10 15 20 25
하면 P(um) 69 69 69 69 69
하면 종횡비 0.12 0.14 0.22 0.29 0.36
상면종횡비/하면종횡비 2.50 2.00 1.33 1.00 0.80
직진성 0.60% 0.53% 0.46% 0.54% 0.67%
휘도(nit) 835.7 852.9 857.3 851.7 814.4
Table 5
Example 10 Example 11 Example 1 Example 12 Comparative Example 9
H (um) 8 10 15 20 25
P (um) 69 69 69 69 69
Aspect ratio 0.12 0.14 0.22 0.29 0.36
Top aspect ratio / bottom aspect ratio 2.50 2.00 1.33 1.00 0.80
Straightness 0.60% 0.53% 0.46% 0.54% 0.67%
Luminance (nit) 835.7 852.9 857.3 851.7 814.4
표 5를 참고하면, 하면 패턴 단면이 다양한 높이와 피치를 갖더라도 그 종횡비가 상면 패턴 단면의 종횡비와 동일하거나 작은 실시예 10 내지 12가 그렇지 않은 비교예 9보다 직진성과 휘도가 우수한 것을 확인할 수 있다.Referring to Table 5, it can be seen that the Examples 10 to 12 whose aspect ratios are equal to or smaller than the aspect ratios of the upper surface pattern cross-sections, even though the lower surface pattern cross-sections have various heights and pitches, are superior to the straightness and luminance than Comparative Example 9. .
실시예 13-17 : 하면의 경사각 변화Example 13-17: Change of the inclination angle of the lower surface
상면의 종횡비(88/300 = 0.29) 및 하면 종횡비(15/69 = 0.22)를 고정하고, 하면 라운드-프리즘 패턴의 경사각을 하기 표 6과 같이 변화시킨 것을 제외하고는 실시예 1과 동일하게 도광판을 제조하였고, 전술한 방법으로 직진성과 휘도를 측정하여 그 결과를 하기 표 6에 기재하였다.The light guide plate was the same as in Example 1 except that the aspect ratio (88/300 = 0.29) and the aspect ratio (15/69 = 0.22) of the upper surface were fixed, and the inclination angle of the lower surface round-prism pattern was changed as shown in Table 6 below. It was prepared, and the straightness and brightness was measured by the above-described method and the results are shown in Table 6 below.
표 6
실시예 13 실시예 14 실시예 15 실시예 1 실시예 16 실시예 17
경사각(°) 15 25 35 45 55 58
직진성 0.60% 0.47% 0.47% 0.46% 0.58% 0.60%
휘도(nit) 811.7 844.4 856 857.3 821.4 813.3
Table 6
Example 13 Example 14 Example 15 Example 1 Example 16 Example 17
Tilt angle (°) 15 25 35 45 55 58
Straightness 0.60% 0.47% 0.47% 0.46% 0.58% 0.60%
Luminance (nit) 811.7 844.4 856 857.3 821.4 813.3
표 6을 참고하면, 본 발명의 바람직한 경사각 범위를 갖는 실시예 14 내지 16이 현저한 직진성 및 휘도를 나타내는 것을 확인할 수 있다.Referring to Table 6, it can be seen that Examples 14 to 16, which have a preferred inclination angle range of the present invention, exhibit remarkable straightness and luminance.
다만, 실시예 13 및 17은 본 발명의 바람직한 경사각 범위를 다소 벗어나서, 직진성과 휘도가 다른 실시예보다 다소 저하되는 것을 확인할 수 있다.However, Examples 13 and 17 slightly out of the preferred inclination angle range of the present invention, it can be seen that the straightness and brightness is slightly lower than the other examples.
[부호의 설명][Description of the code]
100: 도광판 101: 기재100: light guide plate 101: base material
102: 하면 라인형 패턴 103: 홈부102: bottom line pattern 103: groove portion
104: 상면 라인형 패턴104: top line pattern

Claims (15)

  1. 상면과 하면에 양각된 라인형 패턴을 가지며 상기 상면 패턴 단면의 종횡비(높이/피치)가 상기 하면 패턴 단면의 종횡비보다 같거나 크고, 상기 하면에 광원으로부터 멀어질수록 그 간격이 조밀해지는 다수의 홈부를 구비하는 도광판.A plurality of grooves having a line-shaped pattern embossed on an upper surface and a lower surface, and having an aspect ratio (height / pitch) of the upper surface pattern cross-section being equal to or larger than an aspect ratio of the lower surface pattern cross-section, and the distance between the lower surface and the light source being closer to the lower surface pattern. The light guide plate provided with a part.
  2. 청구항 1에 있어서, 상기 하면 패턴 단면의 종횡비는 0.1 내지 0.3인 도광판.The light guide plate according to claim 1, wherein an aspect ratio of the lower surface pattern cross section is 0.1 to 0.3.
  3. 청구항 1에 있어서, 상기 상면 패턴 단면의 종횡비는 0.2 내지 0.5인 도광판.The light guide plate according to claim 1, wherein an aspect ratio of the upper surface pattern cross section is 0.2 to 0.5.
  4. 청구항 1에 있어서, 상기 하면 패턴 단면의 종횡비는 0.1 내지 0.3이고 상기 상면 패턴 단면의 종횡비는 0.2 내지 0.5인 도광판.The light guide plate according to claim 1, wherein an aspect ratio of the lower surface pattern cross section is 0.1 to 0.3 and an aspect ratio of the upper surface pattern cross section is 0.2 to 0.5.
  5. 청구항 1에 있어서, 상기 상면 패턴 단면의 종횡비는 상기 하면 패턴 단면의 종횡비의 1배 내지 2배인 도광판.The light guide plate according to claim 1, wherein an aspect ratio of the upper surface pattern cross section is 1 to 2 times an aspect ratio of the lower surface pattern cross section.
  6. 청구항 1에 있어서, 상기 하면의 라인형 패턴은 라운드-프리즘 패턴, 삼각-프리즘 패턴 및 렌티큘러 패턴으로 이루어진 군에서 선택되는 적어도 하나인 도광판.The light guide plate of claim 1, wherein the line-shaped pattern of the bottom surface is at least one selected from the group consisting of a round-prism pattern, a triangular-prism pattern, and a lenticular pattern.
  7. 청구항 1에 있어서, 상기 하면의 라인형 패턴은 라운드-프리즘 패턴인 도광판.The light guide plate of claim 1, wherein the line-shaped pattern of the bottom surface is a round-prism pattern.
  8. 청구항 7에 있어서, 상기 하면 라운드-프리즘 패턴 단면의 경사각은 15°초과 내지 55°이하인 도광판.The light guide plate of claim 7, wherein an inclination angle of the lower surface round-prism pattern cross section is greater than 15 ° and less than 55 °.
  9. 청구항 1에 있어서, 상기 홈부는 레이저를 조사하여 형성된 것인 도광판.The light guide plate of claim 1, wherein the groove is formed by irradiating a laser.
  10. 청구항 1에 있어서, 상기 상면의 라인형 패턴은 라운드-프리즘 패턴, 삼각-프리즘 패턴 및 렌티큘러 패턴으로 이루어진 군에서 선택되는 적어도 하나인 도광판.The light guide plate of claim 1, wherein the upper linear pattern is at least one selected from the group consisting of a round-prism pattern, a triangular-prism pattern, and a lenticular pattern.
  11. 청구항 1에 있어서, 상기 상면의 라인형 패턴은 렌티큘러 패턴인 도광판.The light guide plate of claim 1, wherein the upper linear pattern is a lenticular pattern.
  12. 청구항 1 내지 11 중 어느 한 항의 도광판을 구비하는 백라이트 유닛.The backlight unit provided with the light guide plate of any one of Claims 1-11.
  13. 청구항 12에 있어서, 상기 도광판의 측면에 발광 다이오드(LED), 유기발광 다이오드(OLED), 열음극관 및 냉음극관으로 이루어진 군에서 선택된 광원을 포함하는 백라이트 유닛.The backlight unit of claim 12, further comprising a light source selected from a group consisting of a light emitting diode (LED), an organic light emitting diode (OLED), a hot cathode tube, and a cold cathode tube on a side of the light guide plate.
  14. 청구항 12에 있어서, 상기 도광판의 하면에 반사 시트를 구비하는 백라이트 유닛.The backlight unit of claim 12, further comprising a reflective sheet on a lower surface of the light guide plate.
  15. 청구항 12의 백라이트 유닛을 구비하는 화상 표시 장치.An image display device comprising the backlight unit of claim 12.
PCT/KR2013/005584 2012-07-06 2013-06-25 Light guide plate and backlight unit comprising same WO2014007483A1 (en)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN105987324A (en) * 2015-02-25 2016-10-05 南京瀚宇彩欣科技有限责任公司 Backlight module and display device with backlight module
CN109212654A (en) * 2017-06-30 2019-01-15 苏州璨宇光学有限公司 Light guide plate

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Publication number Priority date Publication date Assignee Title
KR20010098076A (en) * 2000-04-28 2001-11-08 윤종용 Light guide plate for liquid crystal display device and liquid crystal display device using the same and method for manufacturing of light guide plate
JP2008015449A (en) * 2006-07-04 2008-01-24 Samsung Sdi Co Ltd Backlight unit of liquid crystal display and method of fabricating light guide member
US20090122229A1 (en) * 2007-11-12 2009-05-14 Hyoung-Joo Kim Light guiding and dispersing plate and display device having the same
KR20120065756A (en) * 2010-12-13 2012-06-21 엘지디스플레이 주식회사 Liquid crystal display device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010098076A (en) * 2000-04-28 2001-11-08 윤종용 Light guide plate for liquid crystal display device and liquid crystal display device using the same and method for manufacturing of light guide plate
JP2008015449A (en) * 2006-07-04 2008-01-24 Samsung Sdi Co Ltd Backlight unit of liquid crystal display and method of fabricating light guide member
US20090122229A1 (en) * 2007-11-12 2009-05-14 Hyoung-Joo Kim Light guiding and dispersing plate and display device having the same
KR20120065756A (en) * 2010-12-13 2012-06-21 엘지디스플레이 주식회사 Liquid crystal display device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105987324A (en) * 2015-02-25 2016-10-05 南京瀚宇彩欣科技有限责任公司 Backlight module and display device with backlight module
CN109212654A (en) * 2017-06-30 2019-01-15 苏州璨宇光学有限公司 Light guide plate
CN109212654B (en) * 2017-06-30 2021-06-08 扬昕科技(苏州)有限公司 Light guide plate

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