WO2006041195A1 - Light guide plate and method for producing same - Google Patents

Light guide plate and method for producing same Download PDF

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Publication number
WO2006041195A1
WO2006041195A1 PCT/JP2005/019164 JP2005019164W WO2006041195A1 WO 2006041195 A1 WO2006041195 A1 WO 2006041195A1 JP 2005019164 W JP2005019164 W JP 2005019164W WO 2006041195 A1 WO2006041195 A1 WO 2006041195A1
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WO
WIPO (PCT)
Prior art keywords
light guide
guide plate
light
mold
optical
Prior art date
Application number
PCT/JP2005/019164
Other languages
French (fr)
Japanese (ja)
Inventor
Tomohiro Shiraki
Kazuyuki Obuchi
Original Assignee
Zeon Corporation
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Filing date
Publication date
Application filed by Zeon Corporation filed Critical Zeon Corporation
Priority to JP2006541002A priority Critical patent/JPWO2006041195A1/en
Publication of WO2006041195A1 publication Critical patent/WO2006041195A1/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • 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
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • 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
    • 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
    • G02B6/0045—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 by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
    • 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
    • G02B6/0065—Manufacturing aspects; Material aspects

Definitions

  • the present invention relates to a light guide net and its manufacture. More specifically, the present invention provides a liquid crystal display device capable of providing a high-quality display with both chromaticity unevenness and luminance unevenness being small in terms of the display ⁇ of the liquid crystal display device; it ⁇ Law related. Background
  • Liquid crystal display devices are widely used for display of personal computers, beta televisions, car navigation systems, and the like.
  • the liquid crystal display device includes a liquid crystal display panel and a pack light.
  • a backlight of a liquid crystal display device a sidelight type knock light that is provided in an edge portion of a tubular source is generally used, and a direct type backlight that is provided directly below a display via a light source.
  • Sidelight type pack light is a system in which a light source such as a cold cathode tube is placed on the light X ⁇ surface of the edge of a light guide plate made of a molded product such as transparent methacrylic resin.
  • the sidelight type backlight can easily generate uneven brightness on the light exit surface.
  • the light emitted from a linear light source such as a cold tube is In order to efficiently emit light from the backlight as uniform surface light, a fiber sheet is placed on the opposite side of the light guide plate, a sheet cover S is laminated on the light emission side, and two prisms are placed on it.
  • the sheet is prismatic Stacked so that the directions are perpendicular to each other, and a diffusion sheet is often stacked on top of it ..
  • the brightness of the knocklight is improved, the use of the prism sheet and the installation sheet is reduced, and the thickness of the packlight is reduced.
  • the Alt surface is formed with a rough surface with an arithmetic average roughness of 0.05 to 0.3 m.
  • a light guide plate in which the key to roughness in the longitudinal direction of the Alt surface is roughened compared to the roughness in the thickness direction of the Alt surface is disclosed (Patent Document 2).
  • the light incident surface is roughened by stripes consisting of «along the thickness direction.
  • a light guide plate has been proposed (Patent Document 3).
  • Patent Document 1 Japanese Patent Application Laid-Open No. 9-160000 35 (page 2-3)
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2 0 0 1-8 3 5 1 2 (Page 2)
  • Patent Document 3 Japanese Patent Laid-Open No. 2 0 0 2-1 6 9 0 3 2 (Page 2) Disclosure of the Invention
  • An object of the present invention is to provide a liquid crystal display device TO capable of providing a high-quality display and a method for manufacturing the same in a display MS of a liquid crystal display device, in which both chromaticity unevenness and luminance unevenness are small. It was made.
  • the present inventors have obtained a light guide plate for a liquid crystal display! /
  • the arithmetic average roughness Ra of the light ⁇ surface By setting the arithmetic average roughness Ra of the light ⁇ surface to more than 0.4 m and not more than 2.0 ⁇ m, both the brightness unevenness and the ⁇ unevenness of the display image can be significantly reduced.
  • display B By injecting a thermoplastic resin using a mold whose arithmetic average roughness Ra of the mold surface corresponding to the light incident surface is more than 0.4 ⁇ m and not more than 2.0 ⁇ m, display B It was confirmed that the light guide plate can be easily manufactured with economical power, and the present invention has been completed based on this knowledge.
  • the phase of the optical Alt plane the average roughness Ra is more than 0.4 m and less than 2 ⁇ m or less.
  • an arithmetic mean roughness R a of the mold surface corresponding to the 3 ⁇ 4 ⁇ morphism surface is not more than 2. 0 mu m exceeds a 0. 4 mu m Manufacture of light guide plate with glue,
  • the mold surface other than the mold surface corresponding to the optical Alt surface corresponds to the mold surface corresponding to the optical Sit surface, the mold surface corresponding to the light emitting surface, and the side surface orthogonal to the optical At surface.
  • thermoplastic resin is a resin having an alicyclic ring ⁇ lt> (6) to (10);
  • Fig. 1 is an explanatory diagram showing an example of a sidelight type backlight device
  • Fig. 2 is an explanatory diagram showing measurement points on the light Alt surface of the light guide plate
  • Fig. 3 is a light output of the light guide plate. It is an explanatory diagram showing the measurement points of the surface.
  • 1 is the light guide plate
  • 1 A is the ⁇ Alt surface
  • 1 B is the light exit surface
  • 1 C is the fe ⁇ t surface
  • 2 is the tubular base
  • 3 is the Sl3 ⁇ 4
  • 4 is the prism sheet
  • 5 is the sheet
  • 6 Represents a Si sheet.
  • the light guide plate of the present invention is a light guide plate for a liquid crystal display device, wherein the arithmetic average roughness Ra of the light Alt surface is more than 0.4 ⁇ m and not more than 2.0 m, more preferably light
  • a Arithmetic average roughness Ra of t-plane is 0.4 to 5 ⁇ m or more and 1.5 m or less of light guide plate, more preferably arithmetic average roughness Ra of light incident surface is 0.6 m to 1.3 ⁇ m It is the following light guide plate. If the arithmetic average roughness Ra of the light At surface is 0.4 m or less, "feit unevenness may increase.
  • the shape of the light guide plate of the present invention is not particularly limited.
  • one of the side surfaces is a 3 ⁇ ⁇ plane, the side surface orthogonal to the surface is substantially trapezoidal, and the thickness gradually decreases as the distance from the optical Alt surface increases 3 ⁇ 4 ⁇ .
  • It can be a light guide plate, or it can be formed by combining a light guide plate with a substantially trapezoidal side surface, or a flat plate with a constant thickness, and the two side surfaces are ⁇
  • a light guide plate having a ⁇ surface can also be used. Since the light guide plate whose thickness gradually decreases with distance from the 3 ⁇ 4 ⁇ 3 ⁇ 4 ⁇ plane can emit illumination light efficiently, it can be used appropriately.
  • the arithmetic mean roughness Ra of the light incident surface is determined according to JISB 0 6 0 1 3 for a roughness curve obtained by removing a surface waviness component longer than a predetermined wavelength from a cross-sectional curve by a phase compensation high-pass filter. Or can be read directly using an ultra-deep profile measuring microscope.
  • the arithmetic average roughness Ra of the light incident surface should be more than 0.4 m and less than 2.0 m; there is no particular limitation, for example, it corresponds to the 3 ⁇ 4 ⁇ surface
  • the average surface roughness Ra of the surface to be processed is injection-molded using a mold having a roughness Ra of more than 0.4 ⁇ and less than ⁇ , and the shape of the mold surface can be transferred to the molded product, or Arithmetic average roughness Ra exceeds 0 ⁇ 4 ⁇ by roughening IZ, grinding calorie, sand blasting, etc. on the 3 ⁇ 4Alt surface obtained by injection molding. 2.0 im or less.
  • one of the two surfaces having a large 3 ⁇ 4 is the light reflecting surface, and the other is the light emitting surface.
  • the shape of the light reflecting surface of the light guide plate of the present invention there is no particular limitation on the shape of the light reflecting surface of the light guide plate of the present invention.
  • the light reflecting plate has a prism pattern, a grain pattern having fine irregularities, and a number of minute hemispherical or cylindrical projections.
  • a reflective pattern printed with a white or translucent ink can be formed.
  • the present invention is particularly wrinkled with respect to the optical fiber surface of the prism pattern.
  • the shape of the light exit surface is not particularly limited, and may be a tip pattern having fine irregularities, a pattern having a number of minute hemispherical or cylindrical projections, and the like.
  • the light guide plate of the present invention by providing fine light and unevenness on the light receiving surface and the Z or light emitting surface, the light is uniformly scattered, thereby causing uneven chromaticity and uneven unevenness.
  • the brightness can be improved by emitting light efficiently.
  • the f! ItB ⁇ turn is effective because it can make uneven chromaticity and unevenness more uneven if it is a pattern having minute hemispherical protrusions. .
  • the light guide plate of the present invention is not particularly limited by its manufacturing method, but in the light of the method of making a lead by injection molding of a thermoplastic resin, the arithmetic mean roughness Ra of the mold surface corresponding to the light ⁇ 3 ⁇ 4 surface Ra Is more than 0.4 ⁇ m and not more than 2.0 ⁇ m, more preferably not less than 0.4 5 ⁇ m and not more than 1.5 ⁇ m.
  • the shape of the surface corresponding to the ⁇ projection surface is transferred to the ⁇ projection surface of the light guide plate which is a molded product almost accurately.
  • the arithmetic average roughness Ra of the mold surface corresponding to the surface is 0.4 ⁇ or less, feg unevenness may be increased.
  • the arithmetic average roughness Ra of the mold surface corresponding to the light At surface exceeds 2 ⁇ 0 ⁇ m, uneven brightness may increase.
  • a stamper with a surface arithmetic average roughness Ra of more than 0.4 ⁇ and less than 2. ⁇ can be attached to the die surface corresponding to the feAlt surface.
  • the stamper can be preferably used because a light guide plate having a different arithmetic average roughness Ra on the light incident surface can be produced by replacing the stamper using a single mold.
  • the material of the stamper and examples include stainless steel plates and nickel plates.
  • the thickness of the stamper is preferably 0.2 to 2 mm, and more preferably 0.2 to 1 mm.
  • the arithmetic average roughness Ra of the mold surface or the stamper surface is more than 0.4 ⁇ m and 2.
  • O / im or less is not particularly limited.
  • the shape such as a triangular pyramid, a quadrangular pyramid, and a hexagonal pyramid can be formed by grinding, or roughened by sand plast using an abrasive.
  • the resin melted from the mold surface other than the key surface corresponding to the optical Alt surface is applied to the mold cavity.
  • ⁇ Melting from the mold surface other than the key surface corresponding to the ⁇ surface By melting the melted resin into the mold cavity, the melted resin flows into the surface corresponding to the alt surface with an arithmetic average roughness Ra of more than 0.4 ⁇ m and less than 2.0 ⁇ m. As a result, the shape of the mold surface corresponding to the 3 ⁇ 4AI ⁇ surface can be accurately and well transferred to the molded product.
  • the mold surface other than the surface corresponding to the 3 ⁇ 4 ⁇ projecting surface, the mold surface corresponding to the light reflecting surface, the mold surface corresponding to the light emitting surface, and 3 ⁇ 4Alt surface orthogonal to the molten resin.
  • a mold surface corresponding to the side surface or a mold surface corresponding to the side surface facing the 1 ⁇ 2 AI ⁇ surface can be used.
  • the surface corresponding to the side surface orthogonal to the light incident surface has little effect on the image quality of the display mark of the gate mark liquid crystal display device. It can be suitably used because it can shorten the flow defect until it reaches the mold surface corresponding to the light incident surface, and can prevent an increase in viscosity due to a decrease in the molten resin.
  • the melted shelf is obtained from two mold surfaces corresponding to two side surfaces orthogonal to the light Alt surface of the light guide plate.
  • the gate is provided on the mold surface corresponding to the side surface orthogonal to the light AI ⁇ surface of the light guide plate, and O mm from the ⁇ ! Surface corresponding to the 3 ⁇ 4 ⁇ ! ⁇ surface.
  • the surface force corresponding to the surface is within 0.5 times the length of the side surface.
  • the distance from the mold surface corresponding to the light incident surface is O mm or more away from the mold surface. More preferably, it is within 0.3 times the length of the side surface from the corresponding mold surface.
  • Gate force Light When the mold surface corresponding to the side surface orthogonal to the Alt surface is positioned more than 0.5 times the length of the mold surface corresponding to the side surface from the mold surface corresponding to the 3 ⁇ 4 ⁇ surface, melting occurs. «] S ⁇ until the resin reaches the mold surface corresponding to the 53 ⁇ 4Alt surface becomes longer, and the # surface increases due to the decrease in the temperature of the molten resin.
  • the gate has two left and right points because the length of the molten resin S is shortened.
  • thermoplastic resin used in the present invention there are no particular restrictions on the thermoplastic resin used in the present invention. Can be mentioned. Among these, a resin having an alicyclic structure can be suitably used. Since the resin with mm ⁇ m structure has good flowability of the molten resin, it uses a pin point gate, low level, Fills the mold cavity with the output pressure, accurately transfers the shape of the heel surface, is less susceptible to the generation of wet drainage S, and has extremely low moisture absorption. The light guide plate can be reduced in weight because the specific gravity is low.
  • Examples of the resin having a lunar ring structure include, but are not limited to, norbornene-based monomers or ring-opening copolymers or hydrogenated carotenates thereof, addition polymers of norbornene-based monomers, or attached carotenoids.
  • Copolymers or hydrogenated products thereof polymers of cyclic olefin-based monomers or hydrogenated products thereof, cyclic polymers of cyclic monomer or hydrogen thereof, ID products, bull fats Ring ⁇ tok element-based monomer heavy ⁇ ⁇ this or copolymer or their hydrogenated products, binino! ⁇ M ⁇ ftok element-based polymer or copolymer containing aromatic ring
  • Aromatic charcoal is an unsaturated monomer containing an aromatic ring of a polymer of a monomer based monomer. Can.
  • thermoplastic resin for injection molding examples include polyptadiene and poly (meth) ataryl acid ester.
  • examples of the compounding agent include an antioxidant, an ultraviolet absorber, a light stabilizer, a lubricant, a light u, an antistatic agent, a fluorescent whitening agent, and a light diffusing agent.
  • examples of the light diffusing agent include fine particles composed of cross-linked materials such as polystyrene-based polymers, polysiloxane-based polymers, poly (meth) acrylic acid ester-based polymers, fine particles of fluororesin, palium sulfate, calcium carbonate, silica. And talc.
  • TufST g is a glass of a heat resistant resin used.
  • Example 1 Using a resin having an alicyclic structure [Nippon Zeon Co., Ltd., ZE ONOR 10 06 OR], a 15-inch light guide plate was formed by injection expansion.
  • the gap of the light guide plate is 2 3 O mm in length and 30 6 mm in width, and the thickness of the side surface that becomes the ⁇ Alt surface on the side of 3 0 6 mm 2.0 mm, the side surface facing the 3 ⁇ 4 ⁇ projection surface The other two sides are trapezoidal.
  • a stamper having a prism shape almost perpendicular to the light On the surface corresponding to the light reflecting surface of the mold, a stamper having a prism shape almost perpendicular to the light A surface with a pitch of 50 ⁇ and an apex angle of 120 °, which is a nickel plate, was attached.
  • the stamper with the tip male formed on the surface corresponding to the light exit surface of the mold by sandblasting a nickel plate at a pressure of 0.15 MPa using an alumina abrasive of # 600. was installed.
  • the gate was provided with a fan gate on the surface corresponding to the light incident surface of the mold.
  • a silver sheet [San Higaku Co., Ltd., Hennhan Star] was laminated as a sheet, and an inverted prism sheet [Mitsubishi Rayon Co., Ltd., M2 6 8 Y] on the light exit surface.
  • Spreading the diffusion sheet [Co., Ltd., N, Dl 1 7 TF], and attaching the cold fluorescent lamp Resonance Lighting Co., Ltd., MBVM 1 6 J] on the light At surface, ⁇ ⁇ ⁇
  • the fluorescent lamp was covered with an internal force S silver Sl3 ⁇ 4 to light the pack light.
  • the display screen color male y is divided into the direction of the display screen 1 B shown in Fig. 3.
  • color rule rule [Minolta, CA-1500W] average value of ⁇ 3 ⁇ 4 standard on, H ⁇ N, and average value of color on line segment F
  • ⁇ Mura ⁇ y was 0.0.12.
  • the display picture shown in Fig. 3! ⁇ Two-dimensional color distribution measuring device [Minolta Co., Ltd., CA] at the intersection of nine lines that divide the direction into 10 and 8 lines that divide the direction into 10 and 10 lines. -1 5 0 0 W] was used to measure the luminance, and the luminance ⁇ ⁇ ⁇ was determined as the ratio between the minimum and maximum luminance values. Luminance: was 50%.
  • the sheet was replaced with a white sheet [3 ⁇ 4L, E 60 L], and the same measurement was performed.
  • the chromaticity unevenness ⁇ y was 0.1 ° 12 and the average brightness was 3 4%.
  • the light guide plate was turned on in the same manner as in Example 1 except that one pin point gate was provided at the center position in the thickness direction at a distance of 3 mm.
  • Injection molding can be performed with an injection time of 1 second, a holding pressure of 50 MPa after injection for 7 seconds, a subsequent cooling time of 17 seconds, and a removal time of 5 seconds 30 seconds. I was able to finish it.
  • the average value of the arithmetic average roughness Ra of the light Alt surface of the obtained light guide plate was 0.90 ⁇ m.
  • Arithmetic average roughness The roughness unevenness calculated as the ratio between the minimum and maximum values of Ra was 8 2%, and the roughness unevenness of the optical Alt surface was not a ⁇ !
  • the chromaticity unevenness ⁇ y was 0.013, and the luminance uniformity was 50%.
  • the chromaticity unevenness A y was 0.0 1 12 and the brightness average was 34%.
  • Injection molding injection 1 second, after injection 5 OMP a pressure holding 7 seconds, then cooling 1 7 seconds, removal A cycle time of 5 seconds could be done with 30 seconds, and during that time the molded product could be finished.
  • the average value of the arithmetic average roughness Ra of the light A surface of the obtained light guide plate was 0.49 m.
  • Arithmetic average roughness The roughness unevenness determined as the ratio between the minimum and maximum values of Ra was 90%, and the roughness of the optical Alt surface was good. .
  • the chromaticity unevenness ⁇ y was 0.0 17 and the luminance uniformity was 48%.
  • the chromaticity unevenness A y was 0.0 1 3 and the average luminance was 41%.
  • the injection molding could be performed with the same cycle time of 30 seconds as in Example 3.
  • the average value of the arithmetic average roughness Ra of the light incident surface of the obtained light guide plate is 0.94 ⁇ m, the unevenness of the arithmetic average roughness Ra is 91%, and the unevenness of the light incident surface is uneven. Was good.
  • the chromaticity unevenness ⁇ y was 0.010 and the luminance uniformity was 53%.
  • the chromaticity unevenness A y was 0.0 10 and the luminance average was 38%.
  • a light guide plate was produced in the same manner as in Example 3 except that a stamper having a 37 ⁇ m unevenness was attached, and l3 ⁇ 4 was performed.
  • Injection molding could be performed with the same cycle time of 30 seconds as in difficult example 3.
  • the average value of the arithmetic average roughness Ra of the light ⁇ surface of the obtained light guide plate is 1.34 ⁇ m, the unevenness of the arithmetic average roughness Ra is 94%, and the unevenness of the roughness of the light ⁇ surface was good.
  • the lead was introduced and the surface was made.
  • the hemispherical convex part of the self is formed as a regular messenger E ⁇ , and is arranged so that the side of the surface opposite to the density force S light Alt surface side force HS light Alt surface becomes higher.
  • the light exit surface is divided into 10 ⁇ parallel to the light Alt surface, and the total ratio of the bottom of the half-shaped convex portion in the region contacting the light ⁇ surface is 10.66%
  • the hemispherical convex part of the positive array is provided, and the total ratio of the bottom area of the hemispherical convex part in the area in contact with the side surface facing the light incident surface is 21.33%.
  • Injection molding could be performed with the same cycle time of 30 seconds as in Example 4.
  • the resulting mean value of arithmetic mean roughness Ra of the light Alt surface of the light guide plate, 0, 94 ⁇ m, and average 3 ⁇ 4i arithmetic mean roughness R a is 91%, the roughness of the ⁇ Alt surface The unevenness was good.
  • the chromaticity unevenness Ay was 0.008 and the luminance uniformity was 55%.
  • the chromaticity unevenness Ay was 0.008 and the brightness average was 40%.
  • a light guide plate was mounted and evaluated in the same manner as in Difficult Example 1 except that the injection molded product was processed with a single crystal diamond tool.
  • the average value of the arithmetic average roughness Ra of the 1 ⁇ surface of the obtained light guide plate is 0.20 ⁇ m, the unevenness of the arithmetic average roughness Ra is 69%, and the roughness unevenness of the 3 ⁇ 4Alt surface is not good There wasn't.
  • the chromaticity variation Ay was 0.020, and the luminance uniformity was 35%.
  • the chromaticity unevenness Ay was 0.018, and the luminance average 13 ⁇ 4 was 35%.
  • the roughness average of Ra 2.30 ⁇ m A light guide plate was produced and faced in the same manner as in Example 3 except that a stamper with a slab was attached. Injection molding could be performed with the same cycle time of 30 seconds as in Example 3.
  • the average value of the arithmetic average roughness Ra of the light incident surface of the obtained light guide plate was 2.22 ⁇ m, the irregularity of the arithmetic average roughness Ra was 90%, and the roughness irregularity of the 3 ⁇ 4 ⁇ surface was good. .
  • the chromaticity unevenness ⁇ y was 0.008, and the luminance uniformity was 25%.
  • the chromaticity unevenness Ay was 0.006 and the brightness uniformity was 22%.
  • the chromaticity unevenness y was 0.020, and the luminance uniformity was 34%.
  • the chromaticity unevenness was 0.018, and the brightness uniformity was 35%.
  • Molding cycle time is 40 seconds full
  • Cyclone time is 40 seconds or more * 2: 3 ⁇ 4 ⁇ !
  • ⁇ surface roughness unevenness is as follows:
  • the arithmetic average roughness Ra of the optical Alt surface is 0.49 to 1.34.
  • ⁇ 1 ⁇ 2 Examples 1 to 6 have the same age when using a silver sheet as the sheet. The age when using white sheets is also very high, and the brightness uniformity is high, and the image quality of the liquid crystal display device is excellent.
  • the light guide plate of Comparative Example 1 in which the arithmetic average roughness Ra of the 3 ⁇ 4AI ⁇ surface is 0 ⁇ 20 ⁇ m has a large ⁇ mura ⁇ y.
  • the light guide plate of Comparative Example 2 having an arithmetic average roughness Ra of the optical Alt surface of 2.2 2 has a low chromaticity unevenness ⁇ y but a low brightness leveler.
  • the light guide plate of Comparative Example 3 with a light AI ⁇ surface as a mirror surface has a large wrinkle unevenness Ay.
  • Example 3 to 6 and Comparative Example 2 in which one pinpoint gate is provided on each of the two side surfaces of the mold, the molding cycle is short and the unevenness of the stamper on the optical Alt surface is accurately formed. Transferred to the product, light A t surface roughness unevenness force s is small. On the other hand, in the difficult example 2 in which one pin point gate is provided on only one side of the mold, the uneven transfer of the stamper is insufficient, and the roughness of the 3 ⁇ 4 ⁇ projection surface is large. In Example 1 and Comparative Example 1 in which a fan gate is provided on the optical Alt surface, the gate processing takes time s and the cycle becomes longer. Industrial applicability
  • the arithmetic average roughness Ra of the optical surface is more than 0. 2.
  • the following is used for a liquid crystal display device. A screen can be obtained.
  • the manufacture of the light guide plate of the present invention since the uneven surface on the 3 ⁇ 4 ⁇ surface is formed by transfer on the injection molding surface or the stamper surface, a high-quality light guide plate can be produced efficiently and economically. .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Disclosed is a light guide plate for liquid crystal displays which is characterized in that the light incident surface has an arithmetic average roughness (Ra) of more than 0.4 μm and not more than 2.0 μm. Also disclosed is a method for producing a light guide plate through injection molding of a thermoplastic resin which is characterized in that a die surface corresponding to the light incident surface has an arithmetic average roughness (Ra) of more than 0.4 μm and not more than 2.0 μm. The light guide plate for liquid crystal displays enables to obtain a display screen for liquid crystal displays having high image quality wherein both color variations and luminance variations are small.

Description

明細書 導光 びその製 去 技術分野  Description Light guide and manufacturing technology
本発明は、 導光ネ級びその製 去に関する。 さらに詳しくは、 本発明は、 液晶表示装 置の表示] βにおレヽて、 色度ムラと輝度ムラがともに小さく、 高画質の表示 を与える ことができる液晶表示装翻の導¾¾¾びその製; it ^法に関する。 背景嫌  The present invention relates to a light guide net and its manufacture. More specifically, the present invention provides a liquid crystal display device capable of providing a high-quality display with both chromaticity unevenness and luminance unevenness being small in terms of the display β of the liquid crystal display device; it ^ Law related. Background
パーソナルコンピュータ、 βテレビジョン、 カーナピゲーションシステムなどの表示 翻に、 液晶表示装置が広く用いられている。 液晶表示装置は、 液晶表示パネルとパック ライトとを備えている。 液晶表示装置のバックライトとしては、 管状 原を導 »のエツ ジ部に設 "るサイドライト型ノ ックライトと、 管状 原を光 ¾¾¾¾を介して表示 の 直下に設财る直下型バックライトが一般的に用いられている。 サイドライト型パックラ ィトは、 透明なメタクリル樹脂などの成形品で作られた導光板のエッジ部の光 X†面に、 冷陰極管などの光源を配置する方式であり、 薄型のパックライ卜を実現することができ る。 しかし、 サイドライト型バックライトは、 光出射面に輝度ムラ力 s生じやすい。 冷tt亟 管などの線状の光源から発せられる光を、 均一な面状の光としてバックライトから効率的 に出射させるために、 導光板の應面側には繊シートが觀され、 光出射面側には シートカ S積層され、 その上に 2枚のプリズムシートがプリズムの方向が直交するように積 層され、 さらにその上に拡散シートが積層される が多い。 . ノ ックライトの輝度を向上し、 プリズムシ一トと置シートの使用ネ嫩を減らし、 パッ クライトの薄型化とコストダウンを図るために、 F i g . 1に示すように K 面 1 Cにプ リズム形状を付与する検討が成されている。 この検討によって、 導光板の光出射面側に、 プリズムを導光板側になるように識したプリズムシ一'ト 4と、 その上に鎌シート 5を 積層するだけで輝度が向上されたパックライトが得られている。 しかし、 その際光 AI†面 1 Aの近傍に輝度ムラが発生するので、 その輝度ムラを するために、 導光板の光 Alt 面 1 Aを粗面化する試みがなされてレ、る。 例えば、 繊面にプリズム形状を付与した導光 板の光入射面の中心線上にぉレ、て、 算術平均粗さ Raが 0 · 0 5〜0. 3 0 μ mの範囲内 で、 前記端面を粗面に形成したサイドライト型面光源装置が提案されている（特許文献Liquid crystal display devices are widely used for display of personal computers, beta televisions, car navigation systems, and the like. The liquid crystal display device includes a liquid crystal display panel and a pack light. As a backlight of a liquid crystal display device, a sidelight type knock light that is provided in an edge portion of a tubular source is generally used, and a direct type backlight that is provided directly below a display via a light source. Sidelight type pack light is a system in which a light source such as a cold cathode tube is placed on the light X † surface of the edge of a light guide plate made of a molded product such as transparent methacrylic resin. However, the sidelight type backlight can easily generate uneven brightness on the light exit surface.The light emitted from a linear light source such as a cold tube is In order to efficiently emit light from the backlight as uniform surface light, a fiber sheet is placed on the opposite side of the light guide plate, a sheet cover S is laminated on the light emission side, and two prisms are placed on it. The sheet is prismatic Stacked so that the directions are perpendicular to each other, and a diffusion sheet is often stacked on top of it .. The brightness of the knocklight is improved, the use of the prism sheet and the installation sheet is reduced, and the thickness of the packlight is reduced. In order to reduce the cost, a study has been made to give a prism shape to the K surface 1 C as shown in Fig. 1. This study led to the introduction of a prism on the light exit surface side of the light guide plate. A pack light with improved brightness is obtained simply by stacking the prism sheet 4 and the sickle sheet 5 on the prism sheet 4 so as to be on the optical plate side. Since uneven brightness occurs in the vicinity, an attempt is made to roughen the light Alt surface 1 A of the light guide plate in order to reduce the uneven brightness. Calculating on the center line of the light incident surface of the plate, arithmetic Hitoshiara Ra is 0, 0 5 to 0.3 in the range of 0 mu m A side light type surface light source device in which the end face is formed into a rough surface has been proposed (Patent Document).
1 )。 また、 映り込みによる輝度ムラを低減して、 発光面の品位を向上することができる 導光板として、 算術平均粗さ 0. 0 5 - 0. 3 mの範囲で Alt面を粗面に形成し、 Alt面 の厚み方向における粗さに比して、 Alt面の長手方向における粗さの鍵を粗くした導光 板が ί されている (特許文献 2)。 さらに、 均斉で力 高輝度な大画用の面光源を麵 し得る旨向†生導光板として、 入光 面が、 その厚み方向に沿う «からなる縞 にて粗 面化されている指向性導光板が提案されてレヽる (特許文献 3 )。 1). In addition, as a light guide plate that can reduce brightness unevenness due to reflection and improve the quality of the light-emitting surface, the Alt surface is formed with a rough surface with an arithmetic average roughness of 0.05 to 0.3 m. A light guide plate in which the key to roughness in the longitudinal direction of the Alt surface is roughened compared to the roughness in the thickness direction of the Alt surface is disclosed (Patent Document 2). Furthermore, as a raw light guide plate that can be used as a uniform, powerful, and bright surface light source for large images, the light incident surface is roughened by stripes consisting of «along the thickness direction. A light guide plate has been proposed (Patent Document 3).
しかし、 これらの導光板によっても、 液晶表示装置の表示面画の輝度ムラは十分に満足 し得る水準までは減少 ·¾τΓ、 さらに、 これらの導光板は、 表示画の色度ムラについては ほとんど改良されていない。  However, even with these light guide plates, the brightness unevenness of the display screen of the liquid crystal display device is reduced to a level that can be satisfactorily satisfied. · ¾τΓ, Furthermore, these light guide plates have almost improved the chromaticity unevenness of the display image. It has not been.
[特許文献 1 ] 特開平 9— 1 6 0 0 3 5号公報 (第 2— 3頁）  [Patent Document 1] Japanese Patent Application Laid-Open No. 9-160000 35 (page 2-3)
[特許文献 2 ] 特開 2 0 0 1 - 8 3 5 1 2号公報 (第 2頁）  [Patent Document 2] Japanese Patent Application Laid-Open No. 2 0 0 1-8 3 5 1 2 (Page 2)
[特許文献 3 ] 特開 2 0 0 2— 1 6 9 0 3 2号公報 (第 2頁） 発明の開示  [Patent Document 3] Japanese Patent Laid-Open No. 2 0 0 2-1 6 9 0 3 2 (Page 2) Disclosure of the Invention
本発明は、 液晶表示装置の表示 MSにおいて、 色度ムラと輝度ムラがともに小さく、 高 画質の表示 を与えることができる液晶表示装 TOの導 及びその製^ ^法を す ることを目的としてなされたものである。  An object of the present invention is to provide a liquid crystal display device TO capable of providing a high-quality display and a method for manufacturing the same in a display MS of a liquid crystal display device, in which both chromaticity unevenness and luminance unevenness are small. It was made.
本発明者らは、 上記の 1¾ を解決すべく鋭意職を重ねた結果、 液晶表示装画の導光 板にお！/、て、 光 Λΐί面の算術平均粗さ Raを 0. 4 mを超え 2 . 0 μ m以下とすることに より、表示画の輝度ムラと^ ムラをともに著しく減少させることができ、 さらに、 光 入射面に対応する金型面の算術平均粗さ Raが 0. 4 ^ mを超え 2. 0 μ m以下である金型 を用レヽて熱可塑性樹脂を射出 j¾することにより、 表示 Bの輝度ムラと ムラの少な レ、導光板を経済的力つ容易に製造し得ることを見レ、だし、 この知見に基づレ、て本発明を完 成するに至った。  As a result of intensive efforts to solve the above 1¾, the present inventors have obtained a light guide plate for a liquid crystal display! / By setting the arithmetic average roughness Ra of the light Λΐί surface to more than 0.4 m and not more than 2.0 μm, both the brightness unevenness and the ^ unevenness of the display image can be significantly reduced. By injecting a thermoplastic resin using a mold whose arithmetic average roughness Ra of the mold surface corresponding to the light incident surface is more than 0.4 ^ m and not more than 2.0 μm, display B It was confirmed that the light guide plate can be easily manufactured with economical power, and the present invention has been completed based on this knowledge.
すなわち、 本発明は、  That is, the present invention
( 1 ) 液晶表示装置用の導光板において、 光 Alt面の算相：平均粗さ Raが 0. 4 mを超え 2. Ο μ m以下であることを糊敫とする導 ¾¾、  (1) In the light guide plate for a liquid crystal display device, the phase of the optical Alt plane: the average roughness Ra is more than 0.4 m and less than 2 μm or less.
( 2 ) 光 面の算術平均粗さ Raが 0 · 4 5 μ m以上 1 . 5 ^ m以下である（ 1 )記載の導 光板、 ( 3 ) ¾Λ!ί面から离 るにつれて厚さが薄くなつている（ 1 )記載の導 ¾†反、 (2) The light guide plate according to (1), wherein the arithmetic average roughness Ra of the light surface is from 0 · 45 μm to 1.5 ^ m, (3) The thickness decreases with increasing distance from the ¾Λ! Ί surface.
(4) さらに、 光 面を有し、 嫌己^†面に光入射面と直交する方向のプリズム形状 力 s形成された（ 1)記載の導光板、  (4) The light guide plate according to (1), further having a light surface, and having a prism shape force s formed in a direction perpendicular to the light incident surface on the selfish surface.
(5) 編己導光板が、 脂環 冓造を有する樹脂を含んでいるものである（1)記載の導光  (5) The light guide plate according to (1), wherein the braided light guide plate includes a resin having an alicyclic structure.
(6) 熱 性樹脂の射出成形による導光板の製 去において、 ¾Λ射面に対応する金 型面の算術平均粗さ Raが 0. 4 μ mを超え 2. 0 μ m以下であることを糊敷とする導光板 の製 去、 (6) In removed by manufacturing the light guide plate by injection molding of heat resistant resin, an arithmetic mean roughness R a of the mold surface corresponding to the ¾Λ morphism surface is not more than 2. 0 mu m exceeds a 0. 4 mu m Manufacture of light guide plate with glue,
( 7 ) 光 Alt面に対応する金型面以外の金型面から溶融した樹脂を鍾キヤビティに ¾Λ する（6)記載の導光板の製 去、  (7) The resin melted from the mold surface other than the mold surface corresponding to the optical Alt surface is subjected to ¾Λ, and the light guide plate according to (6) is manufactured.
(8) 光 Alt面に対応する金型面以外の金型面が、 光 Sit面に対応する金型面、 光出射面 に対応する金型面、 光 A t面と直交する側面に対応する金型面のレ、ずれかである（ 7 )記載 の導錄の製 法、  (8) The mold surface other than the mold surface corresponding to the optical Alt surface corresponds to the mold surface corresponding to the optical Sit surface, the mold surface corresponding to the light emitting surface, and the side surface orthogonal to the optical At surface. The manufacturing method of the lead described in (7), which is the displacement of the mold surface,
( 9 ) 光 λ!ί面と直交する側面に対応する金型面から溶融した樹脂を金型キヤビティに注 入する（ 8 )記載の製 去、  (9) Light The molten resin is poured into the mold cavity from the mold surface corresponding to the side surface orthogonal to the λ! Ί surface. (8)
(10) 面と直交する側面に対応する金型面に設けるゲートの位置が、 ¾AI†面に 対応する金型面から 0 mm以上離れ、 光入射面に対応する金型面から該側面長さの 0 · 5 倍以内にある（ 9)言 3¾の導光板の製 法、  (10) The position of the gate provided on the mold surface corresponding to the side surface orthogonal to the surface is 0 mm or more away from the mold surface corresponding to the ¾AI † surface, and the length of the side surface from the mold surface corresponding to the light incident surface. (9) Production method of the light guide plate of the word 3¾,
(1 1) 熱可塑性樹脂が、 脂環 «ltを有する樹脂である（6)ないし（10)のレ、ずれか 1 項に纖の製 法、 及び、  (1 1) The thermoplastic resin is a resin having an alicyclic ring <lt> (6) to (10);
(1 2) ( 1 )ないし（ 5 )のレヽずれか 1項に記載の導光板を有する液晶表示装置、 を Hi共するものである。 図面の簡単な説明  (1 2) The liquid crystal display device having the light guide plate as described in 1 above, wherein Hi is the same as (1) to (5). Brief Description of Drawings
F i g. 1はサイドライト型バックライト装置の一例を示す説明図、 F i g. 2は導光板 の光 Alt面の測定点を示す説明図、 F i g. 3は導光板の光出射面の測定点を示 明図 である。 図中符号 1は導光板、 1 Aは^ Alt面、 1 Bは光出射面、 1 Cは) fe^t面、 2は 管状 原、 3は Sl¾、 4はプリズムシート、 5は シート、 6は Siシートを表す。 発明を実施するための最良の形態 本発明の導光板は、 液晶表示装置用の導光板において、 光 Alt面の算術平均粗さ Raが 0. 4 μ mを超え 2. 0 m以下である導光板であり、 より好ましくは光 A t面の算術平均 粗さ Raが 0. 4 5 μ m以上 1 · 5 m以下の導光板であり、 さらに好ましくは光入射面の 算術平均粗さ Raが 0. 6 m以上 1 . 3 μ m以下の導光板である。 光 A t面の算術平均粗 さ Raが 0. 4 m以下であると、 "feitムラが大きくなるおそれがある。 ^Alt面の算術平 均粗さ Raが 2. を超えると、輝度ムラが大きくなるおそれがある。 光 λ!ί面の算術 平均粗さ Raを 0 · 4 mを超え 2. 0 m以下とすることにより、 色度ムラと輝度ムラを ともに?咸少し、 光 Alt面と TOに る歸泉と暗帯の出現を防止することができる。 Fig. 1 is an explanatory diagram showing an example of a sidelight type backlight device, Fig. 2 is an explanatory diagram showing measurement points on the light Alt surface of the light guide plate, and Fig. 3 is a light output of the light guide plate. It is an explanatory diagram showing the measurement points of the surface. In the figure, 1 is the light guide plate, 1 A is the ^ Alt surface, 1 B is the light exit surface, 1 C is the fe ^ t surface, 2 is the tubular base, 3 is the Sl¾, 4 is the prism sheet, 5 is the sheet, 6 Represents a Si sheet. BEST MODE FOR CARRYING OUT THE INVENTION The light guide plate of the present invention is a light guide plate for a liquid crystal display device, wherein the arithmetic average roughness Ra of the light Alt surface is more than 0.4 μm and not more than 2.0 m, more preferably light A Arithmetic average roughness Ra of t-plane is 0.4 to 5 μm or more and 1.5 m or less of light guide plate, more preferably arithmetic average roughness Ra of light incident surface is 0.6 m to 1.3 μm It is the following light guide plate. If the arithmetic average roughness Ra of the light At surface is 0.4 m or less, "feit unevenness may increase. ^ If the arithmetic average roughness Ra of the Alt surface exceeds 2, uneven luminance will occur. Light λ! Ί surface arithmetic average roughness Ra exceeds 0 · 4 m and less than 2.0 m, so both chromaticity unevenness and brightness unevenness are slightly reduced. Appearance of fountain and dark belt in TO can be prevented.
本発明の導光板の形状に特に制限はなく、 例えば、 側面の 1つを 3· Λ 面とし、 面と直交する側面が略台形で、 光 Alt面から离 ¾τるにつれて厚さが次第に薄くなる導光板 とすることができ、 あるいは、 側面が略台形の導光板を組み^:た形状とすることもで き、 あるいは、 厚さが一定の平板状であって、 相 る 2つの側面が ^λΐί面である導光 板とすることもできる。 ¾Λ¾·面から离 i iるにつれて厚さが次第に薄くなる導光板は、 効 率よく照明光を出 ることができるので、 好適に用レ、ることができる。  The shape of the light guide plate of the present invention is not particularly limited. For example, one of the side surfaces is a 3 · Λ plane, the side surface orthogonal to the surface is substantially trapezoidal, and the thickness gradually decreases as the distance from the optical Alt surface increases ¾τ. It can be a light guide plate, or it can be formed by combining a light guide plate with a substantially trapezoidal side surface, or a flat plate with a constant thickness, and the two side surfaces are ^ A light guide plate having a λΐί surface can also be used. Since the light guide plate whose thickness gradually decreases with distance from the ¾Λ¾ · plane can emit illumination light efficiently, it can be used appropriately.
本発明において、 光入射面の算術平均粗さ Raは、 断面曲線から所定の波長より長い表 面うねり成分を位相補償高域フィルタで除去した粗さ曲線について、 J I S B 0 6 0 1 3 .にしたがって求めることができ、 あるいは、 超深度形状測定顕微鏡などを用いて直読 することもできる。  In the present invention, the arithmetic mean roughness Ra of the light incident surface is determined according to JISB 0 6 0 1 3 for a roughness curve obtained by removing a surface waviness component longer than a predetermined wavelength from a cross-sectional curve by a phase compensation high-pass filter. Or can be read directly using an ultra-deep profile measuring microscope.
本発明の導光板にぉレ、て、 光入射面の算術平均粗さ Raを 0. 4 mを超え 2. 0 m以 下とする；^去に特に制限はなく、 例えば、 ¾Λ 面に対応する面の算術平均粗さ Raが 0. 4 μ πιを超え 2. Ο μ πι以下の金型を用いて射出成形し、 金型面の形状を成形品に転写す ることができ、 あるいは、 射出成形により得られた導憲の ¾Alt面に、切肖 IJ又は研削カロ ェ、 サンドブラストなどを施すことにより粗面化して、 算術平均粗さ Raを 0 · '4 μ ΐηを超 え 2. 0 i m以下とすることもできる。  In the light guide plate of the present invention, the arithmetic average roughness Ra of the light incident surface should be more than 0.4 m and less than 2.0 m; there is no particular limitation, for example, it corresponds to the ¾Λ surface The average surface roughness Ra of the surface to be processed is injection-molded using a mold having a roughness Ra of more than 0.4 μπι and less than Ομππι, and the shape of the mold surface can be transferred to the molded product, or Arithmetic average roughness Ra exceeds 0 · 4 μΐη by roughening IZ, grinding calorie, sand blasting, etc. on the ¾Alt surface obtained by injection molding. 2.0 im or less.
本発明の導赚においては、 ¾A t面と略直交する面のうち、 ®¾の大きい 2面の片方 が光反射面であり、 もう片方が光出射面である。  In the guide of the present invention, of the surfaces substantially orthogonal to the AAt surface, one of the two surfaces having a large ¾ is the light reflecting surface, and the other is the light emitting surface.
本発明の導光板にぉレ、て、 光反射面の形状に特に制限はなく、 例えばプリズムパター ン、 微細な凹凸灘を有するシボパターン、 多数の微小な半球状や円柱状などの突起を有 するパターン、 白又は半透明インキで印刷された反射パターン、 を形成することができ' る。 本発明は、 特にプリズムパターンの光繊面に対して顿である。 本発明の導條において、 光出射面の形状に特に制限はなく、微細な凹凸觀を有する シポパターン、 多数の微小な半球状や円柱状などの突起を有するパターンなどとすること ができる。 There is no particular limitation on the shape of the light reflecting surface of the light guide plate of the present invention. For example, the light reflecting plate has a prism pattern, a grain pattern having fine irregularities, and a number of minute hemispherical or cylindrical projections. A reflective pattern printed with a white or translucent ink can be formed. The present invention is particularly wrinkled with respect to the optical fiber surface of the prism pattern. In the lead of the present invention, the shape of the light exit surface is not particularly limited, and may be a tip pattern having fine irregularities, a pattern having a number of minute hemispherical or cylindrical projections, and the like.
本発明の導光板にぉレヽては、 光謝面及び Z又は光出射面に撒細な囬凸嫌などを設け ることにより、 光を均一に散乱させて色度ムラ及ひ¾度ムラを倾咸することができ、 光を 効率的に出射させて輝度を向上することができる。 さらに、 f!itB^ターンは、 微小な半球 状の突起を有するパターンであると、 色度ムラ及ひ ¾度ムラをより 威できるので有効で ある。 .  In the light guide plate of the present invention, by providing fine light and unevenness on the light receiving surface and the Z or light emitting surface, the light is uniformly scattered, thereby causing uneven chromaticity and uneven unevenness. The brightness can be improved by emitting light efficiently. In addition, the f! ItB ^ turn is effective because it can make uneven chromaticity and unevenness more uneven if it is a pattern having minute hemispherical protrusions. .
本発明の導光板はその製^法によって特に制限されないが、 熱可塑性樹脂の射出成形 による導條の製駄法にぉレヽて、 光 Λ¾·面に対応する金型面の算術平均粗さ Raが 0. 4 μ mを超え 2. 0 μ m以下であり、 より好ましくは 0. 4 5 μ m以上 1 . 5 μ m以下であ る。 熱可塑性樹脂を射出きすることにより、 ½λ射面に文ォ応する «面の形状は、 ほぼ 正確に成形品である導光板の ¾λ射面に転写される。 面に対応する金型面の算術平 均粗さ Raが 0. 4 μ ηι以下であると、 fegムラが大きくなるおそれがある。 光 A t面に対 応する金型面の算術平均粗さ Raが 2 · 0 μ mを超えると、 輝度ムラが大きくなるおそれが める。  The light guide plate of the present invention is not particularly limited by its manufacturing method, but in the light of the method of making a lead by injection molding of a thermoplastic resin, the arithmetic mean roughness Ra of the mold surface corresponding to the light Λ¾ surface Ra Is more than 0.4 μm and not more than 2.0 μm, more preferably not less than 0.4 5 μm and not more than 1.5 μm. By injecting the thermoplastic resin, the shape of the surface corresponding to the λλ projection surface is transferred to the λλ projection surface of the light guide plate which is a molded product almost accurately. When the arithmetic average roughness Ra of the mold surface corresponding to the surface is 0.4 μηι or less, feg unevenness may be increased. When the arithmetic average roughness Ra of the mold surface corresponding to the light At surface exceeds 2 · 0 μm, uneven brightness may increase.
本発明方法において、 光 Alt面に対応する金型面の算術平均粗さ Raを 0. 4 を超え 2 . 0 i m以下とする方法に特に制限はなく、 例えば、 金型面を直接加工することがで き、 あるいは、 表面の算術平均粗さ Raを 0. 4 μ πιを超え 2. Ο μ πι以下に加工したスタ ンパーを) feAlt面に対応する金型面に取り付けることもできる。 スタンパーは、 一つの金 型を用レヽて、 スタンパーの交換により光入射面の算術平均粗さ Raの異なる導光板を製造 することができるので、 好適に用いることができる。 スタンパーの材料に特に制限はな く、 例えば、 ステンレス鋼板やニッケル板などを挙げることができる。 スタンパーの厚さ は、 0. 2〜2 mmであることが好ましく、 0. 2〜l mmであることがより好ましい。 本発明方法にぉレ、て、 金型面又はスタンパ一面の算術平均粗さ Raを 0. 4 μ mを超え 2. O /i m以下とする方法に特に制限はなく、 例えば、 微細加工機を用いて三角錐、 四角 錐、 六角錐などの形状を研削加工により形 ることができ、 あるいは、研磨材を用いる サンドプラストにより粗面化することもできる。  In the method of the present invention, there is no particular limitation on the method of setting the arithmetic mean roughness Ra of the mold surface corresponding to the optical Alt surface to more than 0.4 and not more than 2.0 im, for example, processing the mold surface directly. Alternatively, a stamper with a surface arithmetic average roughness Ra of more than 0.4 μπι and less than 2. μμπι can be attached to the die surface corresponding to the feAlt surface. The stamper can be preferably used because a light guide plate having a different arithmetic average roughness Ra on the light incident surface can be produced by replacing the stamper using a single mold. There are no particular restrictions on the material of the stamper, and examples include stainless steel plates and nickel plates. The thickness of the stamper is preferably 0.2 to 2 mm, and more preferably 0.2 to 1 mm. In the method of the present invention, the arithmetic average roughness Ra of the mold surface or the stamper surface is more than 0.4 μm and 2. O / im or less is not particularly limited. The shape such as a triangular pyramid, a quadrangular pyramid, and a hexagonal pyramid can be formed by grinding, or roughened by sand plast using an abrasive.
本発明方法にぉレ、ては、 光 Alt面に対応する鍵面以外の金型面から溶融した樹脂を金 型キヤビティに ¾Λすること力 s好ましい。 ^ λΐί面に対応する鍵面以外の金型面から溶 融した樹脂を金型キヤビティに ¾Λすることにより、 溶融した樹脂が算術平均粗さ Raが 0. 4 μ mを超え 2. 0 μ m以下である ¾Alt面に対応する面に衝突するように流れ込むの で、 ¾AI†面に対応する金型面の形状を成形品に正確かっ醒性よく転写することができ る。 溶融した樹脂を ¾Λする ¾λ射面に対応する面以外の金型面に特に制限はなく、 光反 射面に対応する金型面、 光出射面に対応する金型面、 ¾Alt面と直交する側面に対応する 金型面、 ½AI†面に対向する側面に対応する金型面のいずれともすることができる。 これ らの中で、 光入射面と直交する側面に対応する 面は、 ゲート痕カ液晶表示装置の表示 麵の画質に与える影響が小さく、 力 、 光入射面の近傍に設けて溶融した樹脂が光入射 面に対応する金型面に針るまでの流動灘を短くし、 溶融樹脂の 低下による粘度上 昇を防ぐことができるので、 好適に用いることができる。 According to the method of the present invention, it is preferable that the resin melted from the mold surface other than the key surface corresponding to the optical Alt surface is applied to the mold cavity. ^ Melting from the mold surface other than the key surface corresponding to the λΐί surface By melting the melted resin into the mold cavity, the melted resin flows into the surface corresponding to the alt surface with an arithmetic average roughness Ra of more than 0.4 μm and less than 2.0 μm. As a result, the shape of the mold surface corresponding to the ¾AI † surface can be accurately and well transferred to the molded product. There is no particular limitation on the mold surface other than the surface corresponding to the ¾λ projecting surface, the mold surface corresponding to the light reflecting surface, the mold surface corresponding to the light emitting surface, and ¾Alt surface orthogonal to the molten resin. Either a mold surface corresponding to the side surface or a mold surface corresponding to the side surface facing the ½ AI † surface can be used. Among these, the surface corresponding to the side surface orthogonal to the light incident surface has little effect on the image quality of the display mark of the gate mark liquid crystal display device. It can be suitably used because it can shorten the flow defect until it reaches the mold surface corresponding to the light incident surface, and can prevent an increase in viscosity due to a decrease in the molten resin.
本発明: において、 溶融した棚旨は、 導光板の光 Alt面と直交する二つの側面に対応 する二つの金型面から ¾Λすることが好ましレヽ。 二つの金型面に各 1個のゲートを設け て、 2力所から溶融した樹脂を¾\することにより、 鍵内における溶融樹脂の灘 S瞧 を減らして成形サイクノレを るとともに、 金型内における溶融樹脂の^^低下による 粘度上昇を防レヽで、金型面の形状を成形品である導光板に正確に転写することができる。 本発明お去にぉレ、て、 導光板の光 AI†面と直交する側面に対応する金型面に設けるゲー トのィ 置〖ま、 ¾Λ!ί面に対応する^!面から O mm以上离 tfb、 面に対応する 面 力ら該側面の長さの 0. 5倍以内にあることが好ましく、 光入射面に対応する金型面から O mm以上离 f†L、 光入射面に対応する金型面から該側面の長さの 0. 3倍以内にあること がより好ましい。 ゲート力 光 Alt面と直交する側面に対応する金型面で、 ¾Λ 面に対 応する金型面から該側面に対応する金型面の長さの 0. 5倍を超える位置に すると、 溶融樹脂が 5¾Alt面に対応する金型面に ^"るまでの «]S瞧が長くなり、 溶融樹脂の温 度低下による #占度上昇のために、 光 Alt面に対応する金型面の転写が不十分になるおそれ がある。 また、 ゲートが左右 2点に することが、 溶融樹脂の «S瞧が短くなるため に好ましい。  In the present invention, it is preferable that the melted shelf is obtained from two mold surfaces corresponding to two side surfaces orthogonal to the light Alt surface of the light guide plate. By providing one gate on each of the two mold surfaces and obtaining the molten resin from two power points, the molten resin in the key is reduced and the molding cycle is reduced. This prevents the increase in viscosity due to the decrease in molten resin in the mold, and allows the shape of the mold surface to be accurately transferred to the light guide plate as a molded product. In the present invention, the gate is provided on the mold surface corresponding to the side surface orthogonal to the light AI † surface of the light guide plate, and O mm from the ^! Surface corresponding to the ¾Λ! Ί surface. It is preferable that the surface force corresponding to the surface is within 0.5 times the length of the side surface. The distance from the mold surface corresponding to the light incident surface is O mm or more away from the mold surface. More preferably, it is within 0.3 times the length of the side surface from the corresponding mold surface. Gate force Light When the mold surface corresponding to the side surface orthogonal to the Alt surface is positioned more than 0.5 times the length of the mold surface corresponding to the side surface from the mold surface corresponding to the ¾Λ surface, melting occurs. «] S 瞧 until the resin reaches the mold surface corresponding to the 5¾Alt surface becomes longer, and the # surface increases due to the decrease in the temperature of the molten resin. In addition, it is preferable that the gate has two left and right points because the length of the molten resin S is shortened.
本発明に用いる熱可塑性樹脂に特に制限はな 例えば、 脂環 造を有する樹脂、 メ タクリル樹脂、 ポリカーボネート、 ポリスチレン、 アクリロニトリル一スチレン共重合 体、 メタタリル酸メチル一スチレン共重合体、 ポリエーテノレス/レホンなどを挙げることが できる。 これらの中で、 脂環 ¾ϋ造を有する樹脂を好適に用いることができる。 mm^m 造を有する樹脂は、溶融樹脂の流動性が良好なので、 ピンボイントゲートを用レ、て低レ、射 出圧力で金型のキヤビティを充填し、 鍾面の形状を正確に転写することができ、 ゥエル ドラインカ S発生しにくく、 吸湿性が極めて低いので寸胺定 t"生に優れ、 導光板に反りを生 ずることがなく、 比重が小さレ、ので導光板を軽量化することができる。 There are no particular restrictions on the thermoplastic resin used in the present invention. Can be mentioned. Among these, a resin having an alicyclic structure can be suitably used. Since the resin with mm ^ m structure has good flowability of the molten resin, it uses a pin point gate, low level, Fills the mold cavity with the output pressure, accurately transfers the shape of the heel surface, is less susceptible to the generation of wet drainage S, and has extremely low moisture absorption. The light guide plate can be reduced in weight because the specific gravity is low.
月旨環 冓造を有する樹脂としては、 例えば、 ノルボルネン系単量体の開纏合体若しく は開環共重合体又はそれらの水素添カロ物、 ノルボルネン系単量体の付加重合体若しくは付 カロ共重合体又はそれらの水素添口物、 賴の環状ォレフィン系単量体の重合体又はその水 素添 物、 環状 *ί殳ジェン系単量体の重合体又はその水素、 ID物、 ビュル脂環^ィ tok素 系単量体の重^ {本若しくは共重合体又はそれらの水素添力 p物、 ビニノ!^ m^ftok素系単 量体の重合体又は共重合体の芳香環を含む不飽和結^ ^分の水素添ロ物などを挙げること ができる。 これらの中で、 ノルボルネン系単量体の重合体の水素励口物及びビニノ！ ^香族 炭ィは素系単量体の重合体の芳香環を含む不飽和結^ ¾分の水素添加物は、漏的弓艘と 謹!"生に優れるので、 特に好適に用レ、ることができる。  Examples of the resin having a lunar ring structure include, but are not limited to, norbornene-based monomers or ring-opening copolymers or hydrogenated carotenates thereof, addition polymers of norbornene-based monomers, or attached carotenoids. Copolymers or hydrogenated products thereof, polymers of cyclic olefin-based monomers or hydrogenated products thereof, cyclic polymers of cyclic monomer or hydrogen thereof, ID products, bull fats Ring ^ tok element-based monomer heavy ^ {this or copolymer or their hydrogenated products, binino! ^ M ^ ftok element-based polymer or copolymer containing aromatic ring An example of the hydrogenated product of unsaturated crystals. Among these, norbornene monomer polymer hydrogen exciters and binino! ^ Aromatic charcoal is an unsaturated monomer containing an aromatic ring of a polymer of a monomer based monomer. Can.
本発明においては、 必要に応じて、 熱可塑性樹脂にその他の重合体、 配合剤、 充填剤な どを混合して射出成形することができる。 その他の重合体としては、 例えば、 ポリプタジ ェン、 ポリ（メタ）アタリル酸エステルなどを挙げることができる。 配合剤としては、 例え ば、 酸化防止剤、 紫外線吸収剤、 光安 ϋ、 滑剤、 可謹 u、 帯電防止剤、 蛍光増白剤、 光 拡散剤などを挙げることができる。 光拡散剤としては、 例えば、 ポリスチレン系重合体、 ポリシロキサン系重合体、 ポリ（メタ）ァクリル酸エステル系重合体などの架橋物からなる 微粒子、 フッ素系樹脂の微粒子、 硫酸パリゥム、 炭酸カルシウム、 シリカ、 タルクなどを 挙げることができる。  In the present invention, if necessary, other polymers, compounding agents, fillers and the like can be mixed with the thermoplastic resin for injection molding. Examples of other polymers include polyptadiene and poly (meth) ataryl acid ester. Examples of the compounding agent include an antioxidant, an ultraviolet absorber, a light stabilizer, a lubricant, a light u, an antistatic agent, a fluorescent whitening agent, and a light diffusing agent. Examples of the light diffusing agent include fine particles composed of cross-linked materials such as polystyrene-based polymers, polysiloxane-based polymers, poly (meth) acrylic acid ester-based polymers, fine particles of fluororesin, palium sulfate, calcium carbonate, silica. And talc.
本発明の導 反の製 法にぉレ、ては、 T g (°C) + 1 0 0 (。C)〜T g + 2 0 0 (°C)、 好 ましくは T g + 1 5 0 (°C)〜T g + 2 0 0 (°C)の測旨 で、 力つ T g— 5 0 (°C)〜T g (°C)、 好ましくは丁§ー3 0 (°0〜丁§ (°0の金型&¾で射出膨する。 なお、 tufST g は、 用いる熱 性樹脂のガラス である。 また、 射出艇は、 2 0 mm/sec~ 2 0 0 mm/sec, 好ましくは 4 0 mm/ sec~ 1 8 0 mmZsecである。 実施例 In the manufacturing method of the conductive material of the present invention, T g (° C) + 1 0 0 (.C) to T g + 2 0 0 (° C), preferably T g + 15 0 (° C) ~T g + 2 in Hakamune of 0 0 (° C), Chikaratsu T g- 5 0 (° C) ~T g (° C), preferably Ding § over 3 0 (° 0 injection Rise in mold & ¾ of ~ Ding § (° 0. Incidentally, TufST g is a glass of a heat resistant resin used. also, injection boat, 2 0 mm / sec ~ 2 0 0 mm / sec, preferably Is 40 mm / sec to 180 mmZsec.
以下に、 実施例を挙げて本発明をさらに詳細に説明するが、 本努明はこれらの実施例に よりなんら限定されるものではない。  Hereinafter, the present invention will be described in more detail with reference to examples, but the present efforts are not limited to these examples.
実施例 1 脂環 冓造を有する樹脂 [日本ゼオン (株)、 Z E ONOR 1 0 6 O R] を用いて、 1 5 ィンチ型導光板を射出膨により條した。 Example 1 Using a resin having an alicyclic structure [Nippon Zeon Co., Ltd., ZE ONOR 10 06 OR], a 15-inch light guide plate was formed by injection expansion.
導光板のポ去は、 縦 2 3 O mm,横 3 0 6 mmであって、 横 3 0 6 mm側の^ Alt面と なる側面の厚さ 2. 0 mm、 ¾Λ射面と対向する側面の厚さ 0. 6 mmであり、他の 2側面 は台形である。  The gap of the light guide plate is 2 3 O mm in length and 30 6 mm in width, and the thickness of the side surface that becomes the ^ Alt surface on the side of 3 0 6 mm 2.0 mm, the side surface facing the ¾Λ projection surface The other two sides are trapezoidal.
金型の光反射面に —応する面には、 ニッケル板を加工したピッチ 5 0 μ πι、 頂角 1 2 0 度で、 光 A 面とほぼ直交するプリズム形状を有するスタンパーを取り付けた。 また、 金 型の光出射面に対応する面には、 ニッケル板を # 6 0 0のアルミナ研磨材を用いて 0. 1 5 MP aの圧力でサンドブラストすることにより、 シポ雄を形成したスタンパーを取り 付けた。 ゲートは、 金型の光入射面に対応する面にファンゲートを設けた。  On the surface corresponding to the light reflecting surface of the mold, a stamper having a prism shape almost perpendicular to the light A surface with a pitch of 50 μππι and an apex angle of 120 °, which is a nickel plate, was attached. In addition, the stamper with the tip male formed on the surface corresponding to the light exit surface of the mold by sandblasting a nickel plate at a pressure of 0.15 MPa using an alumina abrasive of # 600. Was installed. The gate was provided with a fan gate on the surface corresponding to the light incident surface of the mold.
射出成藤 (赚カ 3， 4 4 0 k N)を用い、 ？容融檝旨 7 5。C、 金型 8 0°Cで 導光板を射出藤した。 射出成形は、 射出 1秒、 射出後 5 OMP aの保圧 7秒、 その後の 令却 1 7秒、 取り出し 5秒で行うことができたが、 取り出し後、 成赚の横で行う成形品 のゲートの切断と入光面の処理に 5 7秒かかつてしまったため、 全体のサイクルタイムは 5 7秒であった。  Using injection Naruto (Tsubaki 3, 4 40 kN),? Tolerance 7 5. C, mold The light guide plate was injected at 80 ° C. Injection molding could be performed in 1 second after injection, 5 OMPa pressure holding for 7 seconds after injection, and subsequent dismissal for 17 seconds, and 5 seconds for removal. The total cycle time was 57 seconds because the gate was cut and the light incident surface was 57 seconds.
射出成形品の光 Alt面に ¾するゲートをェンドミルにより切断し、 多結晶ダイヤ石蹄立 をバインダーで固めたバイトで切削することにより粗面ィ匕し、 超深度形状測定顕微鏡 [(株)キーエンス、 VK—9 5 0 0] を用いて、 F i g . 2に示す光入射面 1 Aの端から X方向に 3 0. 6 mmの 2点と中央の 1点 (図中黒点）におレ、て、 測定範囲 2 0 0 μ m角に っレ、て算術平均粗さ Raを測定した。 得られた導光板の光 Alt面の算術平均粗さ Raの平均 値は、 0. 9 であった。 また、 算術平均粗さ Raの最小値と最大値の比として求めた 粗さムラは 5 7 %であり、 光 面の粗さムラは良好ではなかつた。  Cut the gate of the injection molded product on the optical Alt surface with a end mill, and cut the polycrystalline diamond stone ridge with a bite hardened with a binder to roughen the surface. , VK−9 5 0 0], the light incident surface shown in Fig. 2 from the end of 1 A to the 2 points 30.6 mm in the X direction and the center point (black dot in the figure) The arithmetic average roughness Ra was measured over a measuring range of 200 μm square. The average value of the arithmetic average roughness Ra of the light Alt surface of the obtained light guide plate was 0.9. The roughness unevenness determined as the ratio of the minimum value and the maximum value of the arithmetic average roughness Ra was 57%, and the unevenness of the optical surface was not good.
得られた導條の光 ¾f面に、 シートとして銀シート [三 ヒ学 (株)、 ェンハーン スター] を積層し、 光出射面に逆プリズムシート [三菱レイヨン (株)、 M2 6 8 Y] と拡 散シート [(株)ッ、 、ン、 D l 1 7 T F] を積層し、 光 A t面に冷i亟蛍光ランプレヽリ ソン ライティング (株)、 MBVM 1 6 J ] を取り付け、 冷 P爵亟蛍光ランプを内面力 S銀 色の Sl¾で覆ってパックライトを條した。  On the light ¾f surface of the obtained lead, a silver sheet [San Higaku Co., Ltd., Hennhan Star] was laminated as a sheet, and an inverted prism sheet [Mitsubishi Rayon Co., Ltd., M2 6 8 Y] on the light exit surface. Spreading the diffusion sheet [Co., Ltd., N, Dl 1 7 TF], and attaching the cold fluorescent lamp Resonance Lighting Co., Ltd., MBVM 1 6 J] on the light At surface,パ ッ ク The fluorescent lamp was covered with an internal force S silver Sl¾ to light the pack light.
冷it亟蛍光ランプに点灯して 1時間後に、 表示画面の色雄標 yを、 F i g . 3に示す 表示画 1 Bの 向を 1 0等分する 9本の茅紛のうち光 Alt面 1 Aに最も近レ、線分 N上 と、 ¾Alt面から最も遠い線分 F上で、線分を 1 0等分する 9点についてそれぞれ二次元 色分 則趨置 [ミノルタ (株)、 CA- 1 5 0 0W] を用いて測定し、 ，H^N上の^ ¾ 標の平均値と、線分 F上の色 |¾¾標の平均値の差として、 ^^ムラ A yを求めた。 继ム ラ厶 yは、 0. 0 1 2であった。 また、 F i g . 3に示す表示画の！^向を 1 0等分する 9本の線分と、 歡向を 1 0等分する 9本の線分の交点である 8 1点において、 二次元色 分布測定装置 [ミノルタ (株)、 CA- 1 5 0 0W] を用いて輝度を測定し、輝度の最小値 と最大値の比として輝度 ±匀¾ ^を求めた。 輝度: は 5 0 %であった。 1 hour after turning on the cold it fluorescent lamp, the display screen color male y is divided into the direction of the display screen 1 B shown in Fig. 3. 1 Line closest to A, on line segment N, and on line segment F farthest from the ¾Alt plane. Measured by using color rule rule [Minolta, CA-1500W], average value of ^ ¾ standard on, H ^ N, and average value of color on line segment F | ¾¾ standard As the difference, ^^继 Mura 厶 y was 0.0.12. Also, the display picture shown in Fig. 3! ^ Two-dimensional color distribution measuring device [Minolta Co., Ltd., CA] at the intersection of nine lines that divide the direction into 10 and 8 lines that divide the direction into 10 and 10 lines. -1 5 0 0 W] was used to measure the luminance, and the luminance ± 匀 ^ was determined as the ratio between the minimum and maximum luminance values. Luminance: was 50%.
シートを白シート [¾レ (株)、 E 6 0 L] に取り替えて、 同じ測定を行った。 色度 ムラ Δ yは 0.◦ 1 2であり、輝度均 ¾gは 3 4 %であった。  The sheet was replaced with a white sheet [¾L, E 60 L], and the same measurement was performed. The chromaticity unevenness Δy was 0.1 ° 12 and the average brightness was 3 4%.
実施例 2 Example 2
金型の光入射面に対応する面に、 二ッケル板を # 1 2 0 0のァ/レミナ研磨材を用レ、て 0. 4 7MP aの圧力でサンドプラストすることにより、 算術平均粗さ Ra 0. 9 7 mの 凹凸ネ纖を形成したスタンパーを取り付け、 と直交する 1側面の ^Ait面から 2 Arithmetic mean roughness by sand plasting with a nickel plate # 1 2 0 0 / remina abrasive on the surface corresponding to the light incident surface of the mold at a pressure of 0.4 7MPa. Attach a stamper with Ra 0. 9 7 m concavo-convex mesh, and from the ^ Ait side of 1 side perpendicular to
3 mm离 、 厚さ方向の中央の位置にピンボイントゲート 1個を設けた以外は、 実施例 1 と同様にして導光板を條し、 言權を行った。 The light guide plate was turned on in the same manner as in Example 1 except that one pin point gate was provided at the center position in the thickness direction at a distance of 3 mm.
射出成形は、射出 1秒、 射出後 5 0 MP aの保圧 7秒、 その後の冷却 1 7秒、 取り出し 5秒のサイクルタイム 3 0秒で行うことができ、 その間に成形品のグート処理も済ませる ことができた。  Injection molding can be performed with an injection time of 1 second, a holding pressure of 50 MPa after injection for 7 seconds, a subsequent cooling time of 17 seconds, and a removal time of 5 seconds 30 seconds. I was able to finish it.
得られた導光板の光 Alt面の算術平均粗さ Raの平均値は、 0. 9 0 ^ mであった。 算術 平均粗さ Raの最小値と最大値の比として求めた粗さムラは 8 2 %であり、 光 Alt面の粗 さムラは^!子ではなかった。  The average value of the arithmetic average roughness Ra of the light Alt surface of the obtained light guide plate was 0.90 ^ m. Arithmetic average roughness The roughness unevenness calculated as the ratio between the minimum and maximum values of Ra was 8 2%, and the roughness unevenness of the optical Alt surface was not a ^!
反射シートとして銀シートを用いたとき、 色度ムラ Δ yは 0. 0 1 3であり、 輝度均整 度は 5 0 %であった。 シートとして白シートを用いたとき、 色度ムラ A yは 0. 0 1 2であり、輝度均 は 3 4 %であつた。  When a silver sheet was used as the reflection sheet, the chromaticity unevenness Δy was 0.013, and the luminance uniformity was 50%. When a white sheet was used as the sheet, the chromaticity unevenness A y was 0.0 1 12 and the brightness average was 34%.
実施例 3 Example 3
金型の光入射面に対応する面に、 二ッケル板を # 1 2 0 0のアルミナ研磨材を用いて 0. 1 5 MP aの圧力でサンドプラストすることにより、 算術平均粗さ Ra 0. 5 1 μ mの 凹凸機を形成したスタンパーを取り付け、 光 面と直交する両側面の光 Alt面から 2 3 nun离 、 厚さ方向の中央の位置にピンポイントゲート各 1個を設けた以外は、 例 1と同様にして、 導光板を ί懐し、 言鞭を行った。  Arithmetic mean roughness Ra 0. by sand plasting the nickel plate to the surface corresponding to the light incident surface of the mold with # 1 2 0 0 alumina abrasive at a pressure of 0.1 5 MPa. 5 A stamper with a 1 μm ruggedness machine is installed, and the light on both sides orthogonal to the light surface is 2 3 nun from the Alt surface, except that one pinpoint gate is provided at the center in the thickness direction. In the same way as in Example 1, the light guide plate was recorded and spoken.
射出成形は、 射出 1秒、 射出後 5 OMP aの保圧 7秒、 その後の冷却 1 7秒、 取り出し 5秒のサイクルタイム 3 0秒で行うことができ、 その間に成形品のグート も済ませる ことができた。 Injection molding: injection 1 second, after injection 5 OMP a pressure holding 7 seconds, then cooling 1 7 seconds, removal A cycle time of 5 seconds could be done with 30 seconds, and during that time the molded product could be finished.
得られた導光板の光 A 面の算術平均粗さ Raの平均値は、 0. 4 9 mであった。 算術 平均粗さ Raの最小値と最大値の比として求めた粗さムラは 9 0 %であり、 光 Alt面の粗 さムラは良好であった。 .  The average value of the arithmetic average roughness Ra of the light A surface of the obtained light guide plate was 0.49 m. Arithmetic average roughness The roughness unevenness determined as the ratio between the minimum and maximum values of Ra was 90%, and the roughness of the optical Alt surface was good. .
反射シートとして銀シートを用いたとき、 色度ムラ Δ yは 0. 0 1 7であり、 輝度均整 度は 4 8 %であった。 シートとして白シートを用いたとき、 色度ムラ A yは 0. 0 1 3であり、輝度均 ま 4 1 %であった。  When a silver sheet was used as the reflection sheet, the chromaticity unevenness Δy was 0.0 17 and the luminance uniformity was 48%. When a white sheet was used as the sheet, the chromaticity unevenness A y was 0.0 1 3 and the average luminance was 41%.
実施例 4 Example 4
金型の光入射面に対応する面に、 ニッケル板を # 1 2 0 0のアルミナ研磨材を用いて 0. 4 7MP aの圧力でサンドブラストすることによ,り、 算術平均粗さ Ra O . 9 7 mの 凹凸 を形成したスタンパーを取り付けた以外は、 例 3と同様にして、 導光板を作 製し、 fffiを行った。  Arithmetic average roughness Ra O by sandblasting a nickel plate with a # 1 2 0 0 alumina abrasive at a pressure of 0.4 MPa to the surface corresponding to the light incident surface of the mold. 9 A light guide plate was made and fffi- cued in the same manner as in Example 3 except that a stamper with a 7-m unevenness was attached.
射出成形は実施例 3と同じサイクノレタイム 3 0秒で行うことができた。 得られた導光板 の光入射面の算術平均粗さ Raの平均値は、 0. 9 4 μ mであり、 算術平均粗さ Raのムラ は 9 1 %であり、 光入射面の粗さムラは良好であった。  The injection molding could be performed with the same cycle time of 30 seconds as in Example 3. The average value of the arithmetic average roughness Ra of the light incident surface of the obtained light guide plate is 0.94 μm, the unevenness of the arithmetic average roughness Ra is 91%, and the unevenness of the light incident surface is uneven. Was good.
シートとして銀シートを用 ヽたとき、 色度ムラ Δ yは 0. 0 1 0であり、 輝度均整 度は 5 3 %であった。 Sitシートとして白シートを用いたとき、 色度ムラ A yは 0. 0 1 0であり、 輝度均 は 3 8 %であった。  When a silver sheet was used as the sheet, the chromaticity unevenness Δy was 0.010 and the luminance uniformity was 53%. When a white sheet was used as the Sit sheet, the chromaticity unevenness A y was 0.0 10 and the luminance average was 38%.
麵列 5 Row 5
金型の光 AI†面に対応する面に、 二ッケル板を # 1 2 0 0のァノレミナ研磨材を用レヽて 0. 7 4MP aの圧力でサンドブラストすることにより、 算術平均粗さ Ra 1 . 3 7 μ mの 凹凸 を形成したスタンパーを取り付けた以外は、 実施例 3と同様にして、 導光板を作 製し、 l¾を行った。  Arithmetic average roughness Ra 1 by sandblasting a nickel plate with # 1 2 0 0 anolemina abrasive on the surface corresponding to the light AI † surface of the mold at a pressure of 0.7 MPa. A light guide plate was produced in the same manner as in Example 3 except that a stamper having a 37 μm unevenness was attached, and l¾ was performed.
射出成形は難例 3と同じサイクルタイム 3 0秒で行うことができた。 得られた導光板 の光 Λ 面の算術平均粗さ Raの平均値は、 1 . 3 4 μ mであり、 算術平均粗さ Raのムラ は 9 4 %であり、 光 ΐλ 面の粗さムラは良好であつた。  Injection molding could be performed with the same cycle time of 30 seconds as in difficult example 3. The average value of the arithmetic average roughness Ra of the light Λ surface of the obtained light guide plate is 1.34 μm, the unevenness of the arithmetic average roughness Ra is 94%, and the unevenness of the roughness of the light ΐλ surface Was good.
シートとして銀シートを用レ、たとき、 色度ムラ Δ yは 0. 0 0 8であり、 輝度均整 度は 3 9 %であった。 Sitシートとして白シートを用いたとき、 色度ムラ A yは 0. 0 0 6であり、 輝度均 は 3 4 %であった。 実施例 6 When a silver sheet was used as the sheet, the chromaticity unevenness Δy was 0.008, and the luminance uniformity was 39%. When a white sheet was used as the Sit sheet, the chromaticity unevenness A y was 0.0 0 6 and the brightness average was 34%. Example 6
金型の光出射面に対応する面に、 直径 6 μηι、 高さ 3 μπι、 底 ®¾28. 3 Mm2の半 球状の凸部を、 底面積の合計が光出射面の全表面積の 16 %になるように 散酉己置できる スタンパーを取り付けた以外は実施例 4と同様にして、 導條を條し、 言?{面を行った。 なお、 膽己半球状凸部は、 正施子 E ^とし、 密度力 S光 Alt面側力 HS 光 Alt面と対 向する側面側が高くなるように配置した。 すなわち、 光出射面を、 光 Alt面に平行に 10 ^^に分割し、 光 Λ 面に接する領域に、 その領域に占める半 状凸部の底 の合計割 合が 1 0. 66%になるように、 正;^子配列の半球状凸部を設けると共に、 光入射面と 対向する側面に接する領域に、 その領域に占める半球状凸部の底面積の合計割合が 21. 33%になるように、 正方格子配列の半 状凸部を設け、 その他の領域の正方 酉己歹 IJの 半球状凸部の密度を 泉的に変化させた。 On the surface corresponding to the light exit surface of the mold, a hemispherical convex part with a diameter of 6 μηι, a height of 3 μπι, and a bottom ®¾28. 3 M m 2 , and the total area of the bottom area is 16 In the same manner as in Example 4 except that a stamper that can be placed in a self-contained manner was installed, the lead was introduced and the surface was made. Here, the hemispherical convex part of the self is formed as a regular messenger E ^, and is arranged so that the side of the surface opposite to the density force S light Alt surface side force HS light Alt surface becomes higher. In other words, the light exit surface is divided into 10 ^^ parallel to the light Alt surface, and the total ratio of the bottom of the half-shaped convex portion in the region contacting the light Λ surface is 10.66% As described above, the hemispherical convex part of the positive array is provided, and the total ratio of the bottom area of the hemispherical convex part in the area in contact with the side surface facing the light incident surface is 21.33%. In this way, we provided a semi-convex portion of a square lattice arrangement, and varied the density of the hemispherical convex portions of the square IJ in other regions.
射出成形は、 実施例 4と同じサイクルタイム 30秒で行うことができた。 得られた導光 板の光 Alt面の算術平均粗さ Raの平均値は、 0, 94 ^ mであり、 算術平均粗さ Raの均 ¾i は 91 %であり、 ^Alt面の粗さムラは良好であった。 Injection molding could be performed with the same cycle time of 30 seconds as in Example 4. The resulting mean value of arithmetic mean roughness Ra of the light Alt surface of the light guide plate, 0, 94 ^ m, and average ¾i arithmetic mean roughness R a is 91%, the roughness of the ^ Alt surface The unevenness was good.
K シートとして銀シートを用いたとき、 色度ムラ Ayは 0. 008であり、 輝度均整 度は 55%であった。 S#†シートとして白シートを用いたとき、 色度ムラ Ayは 0. 00 8であり、輝度均 ¾®は 40 %であった。  When a silver sheet was used as the K sheet, the chromaticity unevenness Ay was 0.008 and the luminance uniformity was 55%. When a white sheet was used as the S # † sheet, the chromaticity unevenness Ay was 0.008 and the brightness average was 40%.
比較例 1 Comparative Example 1
射出成形品の処理を単結晶ダイヤモンド製のバイトで行うこと以外は、 難例 1と同様 にして、 導光板を «し、 評価を行った。  A light guide plate was mounted and evaluated in the same manner as in Difficult Example 1 except that the injection molded product was processed with a single crystal diamond tool.
得られた導光板の)1 έΛΐί面の算術平均粗さ Raの平均値は 0. 20 μ mであり、 算術平均 粗さ Raのムラは 69%であり、 ¾Alt面の粗さムラは良好ではなかった。 The average value of the arithmetic average roughness Ra of the 1 ΐΛΐί surface of the obtained light guide plate is 0.20 μm, the unevenness of the arithmetic average roughness Ra is 69%, and the roughness unevenness of the ¾Alt surface is not good There wasn't.
繊シートとして銀シートを用いたとき、 色度ムラ Ayは 0. 020であり、 輝度均整 度は 35%であった。 Sitシートとして白シートを用いたとき、 色度ムラ Ayは 0. 0 1 8であり、輝度均 ¾1¾は 35 %であった。  When a silver sheet was used as the fiber sheet, the chromaticity variation Ay was 0.020, and the luminance uniformity was 35%. When a white sheet was used as the Sit sheet, the chromaticity unevenness Ay was 0.018, and the luminance average 1¾ was 35%.
比較例 2 Comparative Example 2
金型の光入射面に対応する面に、 ニッケル板を # 1 800のアルミナ研磨材を用いて 0. 88MP aの圧力でサンドブラストすることにより、 算術平均粗さ Ra 2. 30 μ mの 凹凸纖を形成したスタンパーを取り付けた以外は、 »例 3と同様にして、 導光板を作 製し、 面を行った。 射出成形は実施例 3と同じサイクルタイム 30秒で行うことができた。 得られた導光板 の光入射面の算術平均粗さ Raの平均値は、 2.22 μ mであり、 算術平均粗さ Raのムラ は 90 %であり、 ¾λ 面の粗さムラは良好であった。 By sandblasting a nickel plate with # 1 800 alumina abrasive at a pressure of 0.8MPa on the surface corresponding to the light incident surface of the mold, the roughness average of Ra 2.30 μm A light guide plate was produced and faced in the same manner as in Example 3 except that a stamper with a slab was attached. Injection molding could be performed with the same cycle time of 30 seconds as in Example 3. The average value of the arithmetic average roughness Ra of the light incident surface of the obtained light guide plate was 2.22 μm, the irregularity of the arithmetic average roughness Ra was 90%, and the roughness irregularity of the ¾λ surface was good. .
反射シートとして銀シートを用いたとき、 色度ムラ Δ yは 0.008であり、 輝度均整 度は 25%であった。 Sitシートとして白シートを用いたとき、 色度ムラ Ayは 0.00 6であり、 輝度均整度は 22 %であった。  When a silver sheet was used as the reflection sheet, the chromaticity unevenness Δy was 0.008, and the luminance uniformity was 25%. When a white sheet was used as the Sit sheet, the chromaticity unevenness Ay was 0.006 and the brightness uniformity was 22%.
比較例 3 Comparative Example 3
金型の光 Λ 面に対応する面に、 鏡面の二ッケル板からなるスタンパーを取り付けた以 外は、 難例 3と同様にして、 導光板を條し、 f面を行った。 射出成形は実施例 3と同 じサイクルタイム 30秒で行うことができた。  In the same way as in Difficult Example 3, except that a mirror-made stamper plate was attached to the surface corresponding to the light Λ surface of the mold, the light guide plate was turned and the f surface was performed. Injection molding could be performed with the same cycle time of 30 seconds as in Example 3.
反射シートとして銀シートを用いたとき、 色度ムラ厶 yは 0.020であり、 輝度均整 度は 34%であった。 シートとして白シートを用いたとき、 色度ムラ は 0.01 8であり、 輝度均整度は 35%であった。  When a silver sheet was used as the reflection sheet, the chromaticity unevenness y was 0.020, and the luminance uniformity was 34%. When a white sheet was used as the sheet, the chromaticity unevenness was 0.018, and the brightness uniformity was 35%.
実施例 〜 6及び比■ 〜 3の結果を、 第 1表に示す。 The results of Examples -6 and ratios -3 are shown in Table 1.
第 1表 Table 1
Figure imgf000014_0001
Figure imgf000014_0001
* 1 ：膨サィクルは以下の講で言權し * 1: The expansion cycle is discussed in the following lecture.
〇：成形サイクノレタイムが 4 0秒 満 X： サイクノレタイムが 4 0秒以上 * 2 ： ¾Λ!ί面の粗さムラは以下の »で し  ◯: Molding cycle time is 40 seconds full X: Cyclone time is 40 seconds or more * 2: ¾Λ! Ί surface roughness unevenness is as follows:
〇：粗さムラが 8 5 %以上 X：粗さムラが 8 5 %未満 ○: Roughness is 85% or more X: Roughness is less than 85%
第 1表に見られるように、 光 Alt面の算術平均粗さ Raが 0. 4 9〜 1. 3 4である^ ½ 例 1〜6の導錄は、 シートとして銀シートを用いた齢も、 白シートを用いた齢 も、 倾ムラ A y力 M、さく、輝度均鍵が高く、 液晶表示装置の表示画の画質に優れて いる。 これに対して、 ¾AI†面の算術平均粗さ Raが 0 · 2 0 μ mである比較例 1の導光板 は、 倾ムラ厶 yが大きい。 光 Alt面の算術平均粗さ Raが 2. 2 2である比較例 2の導光 板は、 色度ムラ Δ yは小さレ、が、輝度均盤が低レ、。 光 AI†面を鏡面とした比較例 3の導 光板は、 继ムラ A yが大きい。 As shown in Table 1, the arithmetic average roughness Ra of the optical Alt surface is 0.49 to 1.34. ^ ½ Examples 1 to 6 have the same age when using a silver sheet as the sheet. The age when using white sheets is also very high, and the brightness uniformity is high, and the image quality of the liquid crystal display device is excellent. In contrast, the light guide plate of Comparative Example 1 in which the arithmetic average roughness Ra of the ¾AI † surface is 0 · 20 μm has a large 倾 mura 倾 y. The light guide plate of Comparative Example 2 having an arithmetic average roughness Ra of the optical Alt surface of 2.2 2 has a low chromaticity unevenness Δy but a low brightness leveler. The light guide plate of Comparative Example 3 with a light AI † surface as a mirror surface has a large wrinkle unevenness Ay.
金型の 2つの側面にそれぞれ 1個ずつのピンポィントゲートを設けた実施例 3〜 6及び 比較例 2では、 成形サイクルが短く、 光 Alt面に設けたスタンパーの凹凸^ ftが正確に成 形品に転写されて、 光 A t面の粗さムラ力 s小さい。 これに対して、 金型の 1つの側面のみ にピンボイントゲート 1個を設けた難例 2では、 スタンパーの凹凸嫌の転写が不十分 で、 ¾Λ射面の粗さムラが大きい。 光 Alt面にファンゲートを設けた実施例 1及び比較例 1では、 ゲート処理に時間力 sかかって サイクルが長くなっている。 産業上の利用可能性  In Examples 3 to 6 and Comparative Example 2 in which one pinpoint gate is provided on each of the two side surfaces of the mold, the molding cycle is short and the unevenness of the stamper on the optical Alt surface is accurately formed. Transferred to the product, light A t surface roughness unevenness force s is small. On the other hand, in the difficult example 2 in which one pin point gate is provided on only one side of the mold, the uneven transfer of the stamper is insufficient, and the roughness of the ¾Λ projection surface is large. In Example 1 and Comparative Example 1 in which a fan gate is provided on the optical Alt surface, the gate processing takes time s and the cycle becomes longer. Industrial applicability
本発明の導光板は、 光 面の算術平均粗さ Raが 0. を超え 2. 以下であ るので、 液晶表示装置に用いて、 继ムラと輝度ムラがともに小さレ、優れた画質の表示画 面を得ることができる。 本発明の導光板の製^去によれば、 ¾Λ 面の凹凸觀を射出 成形鍾面又はスタンパ一面の転写により形财るので、 高品質の導光板を効率よく経済 的に製造することができる。  In the light guide plate of the present invention, the arithmetic average roughness Ra of the optical surface is more than 0. 2. The following is used for a liquid crystal display device. A screen can be obtained. According to the manufacture of the light guide plate of the present invention, since the uneven surface on the ¾Λ surface is formed by transfer on the injection molding surface or the stamper surface, a high-quality light guide plate can be produced efficiently and economically. .

Claims

請求の範囲 The scope of the claims
1. 液晶表示装置用の導光板において、 光入射面の算術平均粗さ Raが 0. 4 mを超え 2. 0 μ m以下であることを樹敷とする導光ネ瓦 1. In a light guide plate for a liquid crystal display device, a light guide net roof whose arithmetic average roughness Ra of the light incident surface is more than 0.4 m and less than 2.0 μm.
2. 光 Alt面の算術平均粗さ Raが 0 · 45 m以上 1. 5 ^ m以下である請求の範囲 1記 載の導光 2. Arithmetic mean roughness Ra of optical Alt surface Ra is 0 · 45 m or more and 1.5 ^ m or less.
3. 5feAf面から,るにつれて厚さが薄くなっている請求の範囲 1記載の導光！^ 3. The light guide according to claim 1, wherein the thickness decreases from the 5feAf surface. ^
4. さらに、 光 面を有し、 tilt己光 面に ¾Alt面と直交する方向のプリズム形状が 形成された請求の範囲 1記載の導光 4. The light guide according to claim 1, further comprising an optical surface, wherein a prism shape in a direction orthogonal to the ¾Alt surface is formed on the tilt self-light surface.
5. Ιίίΐ己導光板が、 脂環 5¾f造を有する樹脂を含んでいるものである請求の範囲 1曾 の 導光 fe 5. The light guide fe of claim 1 wherein the light guide plate includes a resin having an alicyclic structure of 5¾f.
6. 熱可塑性樹脂の射出成形による導光板の製 去において、 光 Alt面に対応する金型 面の算体亍平均粗さ Raが 0 · 4 μ mを超え 2. 0 m以下であることを樹敫とする導光板の 製造 去。  6. In the manufacture of the light guide plate by injection molding of thermoplastic resin, the arithmetic mean roughness Ra of the mold surface corresponding to the optical Alt surface should be more than 0 · 4 μm and less than 2.0 m. Manufacture of light guide plate as a tree.
7. 光 A t面に対応する金型面以外の金型面から溶融した樹脂を金型キャビティに ¾Λす る請求の範囲 6記載の導光板の製 去。  7. The light guide plate according to claim 6, wherein the resin melted from the mold surface other than the mold surface corresponding to the optical At surface is transferred to the mold cavity.
8. ^AI†面に対応する金型面以外の: 面が、 光 面に対応する金型面、 光出射面に 对応する金型面、 ¾λ!ί面と直交する側面に対応する金型面の！/、ずれかである請求の範囲 7記載の導光板の製 去。  8. Other than the mold surface corresponding to the ^ AI † surface: The surface corresponds to the mold surface corresponding to the light surface, the mold surface corresponding to the light output surface, and the side surface orthogonal to the ¾λ! Ί surface. Of the mold surface! The manufacturing of the light guide plate according to claim 7, wherein the light guide plate is misaligned.
9. ¾Λ射面と直交する側面に対応する金型面から溶融した樹脂を キヤビティに ¾Λ する請求の範囲 8纖の製造规  9. ¾Λ of the melted resin from the mold surface corresponding to the side surface orthogonal to the ¾Λ projection surface.
10. 光 Alt面と する側面に対応する金型面に設けるゲートの位置が、 光 面に対 応する金型面から 0 mm以上离 t i、 光 Alt面に対応する金型面から該側面長さの 0. 5倍 以内にある請求の範囲 9記載の導 ¾|及の製 、法。  10. The position of the gate provided on the mold surface corresponding to the optical Alt surface is at least 0 mm away from the mold surface corresponding to the optical surface, and the side length from the mold surface corresponding to the optical Alt surface. The method according to claim 9, wherein the method is within 0.5 times.
1 1. 熱 个生棚旨が、脂環 冓造を有する樹脂である請求の範囲 6ないし 10のレ、ずれ かに記載の製 去。  1 1. The manufacture according to claim 6, wherein the individual shelf is a resin having an alicyclic structure.
1 2. 請求の範囲 1ないし 5のレヽ T bかに首 の導光板を有する液晶表示装 go  1 2. A liquid crystal display device having a light guide plate at the neck Tb of claims 1 to 5
PCT/JP2005/019164 2004-10-13 2005-10-12 Light guide plate and method for producing same WO2006041195A1 (en)

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JP2008107376A (en) * 2006-10-23 2008-05-08 Citizen Electronics Co Ltd Thin type light guide plate and its molding method
JP2015507346A (en) * 2012-02-17 2015-03-05 スリーエム イノベイティブ プロパティズ カンパニー Backlight guide

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WO2009099219A1 (en) * 2008-02-07 2009-08-13 Sony Corporation Light guide plate, surface illumination device, liquid crystal display device, and manufacturing method for the light guide plate
US20120170310A1 (en) * 2011-01-05 2012-07-05 Qualcomm Mems Technologies, Inc. Light guide with uniform light distribution

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JPH10133023A (en) * 1996-10-30 1998-05-22 Mitsubishi Chem Corp Surface light source device
JP2000221328A (en) * 1999-01-29 2000-08-11 Nippon Zeon Co Ltd Light transmission plate
JP2001154028A (en) * 1999-12-01 2001-06-08 Enplas Corp Light transmission plate, side light type light source device and liquid crystal display
JP2003109417A (en) * 2000-12-12 2003-04-11 International Manufacturing & Engineering Services Co Ltd Surface light source device

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JP2000221328A (en) * 1999-01-29 2000-08-11 Nippon Zeon Co Ltd Light transmission plate
JP2001154028A (en) * 1999-12-01 2001-06-08 Enplas Corp Light transmission plate, side light type light source device and liquid crystal display
JP2003109417A (en) * 2000-12-12 2003-04-11 International Manufacturing & Engineering Services Co Ltd Surface light source device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008107376A (en) * 2006-10-23 2008-05-08 Citizen Electronics Co Ltd Thin type light guide plate and its molding method
JP2015507346A (en) * 2012-02-17 2015-03-05 スリーエム イノベイティブ プロパティズ カンパニー Backlight guide

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