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WO2014007483A1 - Plaque de guidage de lumière et unité de rétroéclairage comportant cette plaque - Google Patents

Plaque de guidage de lumière et unité de rétroéclairage comportant cette plaque 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
Authority
WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
pattern
aspect ratio
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2013/005584
Other languages
English (en)
Korean (ko)
Inventor
이명원
금중한
정창환
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongwoo Fine Chem Co Ltd
Original Assignee
Dongwoo Fine Chem Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020130072451A external-priority patent/KR20140006714A/ko
Application filed by Dongwoo Fine Chem Co Ltd filed Critical Dongwoo Fine Chem Co Ltd
Publication of WO2014007483A1 publication Critical patent/WO2014007483A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention se rapporte à une plaque de guidage de lumière ainsi qu'à une unité de rétroéclairage comportant cette plaque. Plus particulièrement, l'invention a trait à une plaque de guidage de lumière : qui permet d'obtenir une luminance et une linéarité améliorées de la lumière émise grâce à des motifs linéaires en relief sur les surfaces supérieure et inférieure de ladite plaque ; qui présente un rapport de forme (hauteur/pas) de la partie supérieure au moins égal au rapport de forme du motif de surface inférieure ; et qui possède une pluralité de rainures dont l'espacement diminue à mesure que la distance les séparant d'une source de lumière augmente sur la surface inférieure de cette plaque de guidage de lumière. L'invention a trait également à une unité de rétroéclairage comportant ladite plaque.
PCT/KR2013/005584 2012-07-06 2013-06-25 Plaque de guidage de lumière et unité de rétroéclairage comportant cette plaque Ceased WO2014007483A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20120074013 2012-07-06
KR10-2012-0074013 2012-07-06
KR10-2013-0072451 2013-06-24
KR1020130072451A KR20140006714A (ko) 2012-07-06 2013-06-24 도광판 및 이를 포함하는 백라이트 유닛

Publications (1)

Publication Number Publication Date
WO2014007483A1 true WO2014007483A1 (fr) 2014-01-09

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PCT/KR2013/005584 Ceased WO2014007483A1 (fr) 2012-07-06 2013-06-25 Plaque de guidage de lumière et unité de rétroéclairage comportant cette plaque

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WO (1) WO2014007483A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105987324A (zh) * 2015-02-25 2016-10-05 南京瀚宇彩欣科技有限责任公司 背光模块与具有该背光模块的显示装置
CN109212654A (zh) * 2017-06-30 2019-01-15 苏州璨宇光学有限公司 导光板

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010098076A (ko) * 2000-04-28 2001-11-08 윤종용 액정표시장치의 도광판, 이를 이용한 액정표시장치 및도광판의 제조방법
JP2008015449A (ja) * 2006-07-04 2008-01-24 Samsung Sdi Co Ltd 液晶表示装置のバックライトユニットおよび導光板の製造方法
US20090122229A1 (en) * 2007-11-12 2009-05-14 Hyoung-Joo Kim Light guiding and dispersing plate and display device having the same
KR20120065756A (ko) * 2010-12-13 2012-06-21 엘지디스플레이 주식회사 액정표시장치

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010098076A (ko) * 2000-04-28 2001-11-08 윤종용 액정표시장치의 도광판, 이를 이용한 액정표시장치 및도광판의 제조방법
JP2008015449A (ja) * 2006-07-04 2008-01-24 Samsung Sdi Co Ltd 液晶表示装置のバックライトユニットおよび導光板の製造方法
US20090122229A1 (en) * 2007-11-12 2009-05-14 Hyoung-Joo Kim Light guiding and dispersing plate and display device having the same
KR20120065756A (ko) * 2010-12-13 2012-06-21 엘지디스플레이 주식회사 액정표시장치

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105987324A (zh) * 2015-02-25 2016-10-05 南京瀚宇彩欣科技有限责任公司 背光模块与具有该背光模块的显示装置
CN109212654A (zh) * 2017-06-30 2019-01-15 苏州璨宇光学有限公司 导光板
CN109212654B (zh) * 2017-06-30 2021-06-08 扬昕科技(苏州)有限公司 导光板

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