WO2006041195A1 - Plaque guide de lumière et procédé de fabrication de ladite plaque - Google Patents

Plaque guide de lumière et procédé de fabrication de ladite plaque 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
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English (en)
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/ja
Publication of WO2006041195A1 publication Critical patent/WO2006041195A1/fr

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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

L’invention concerne une plaque guide de lumière pour affichages à cristaux liquides, caractérisée en ce que la surface incidente de lumière a une rugosité moyenne arithmétique (Ra) supérieure à 0,4 µm et ne dépassant pas 2,0 µm. Elle porte également sur un procédé de fabrication d’une plaque guide de lumière par moulage par injection d’une résine thermoplastique qui est caractérisé en ce qu’une surface de filière correspondant à la surface incidente de lumière a une rugosité moyenne arithmétique (Ra) supérieure à 0,4 µm et ne dépassant pas 2,0 µm. La plaque guide de lumière pour affichages à cristaux liquides permet d’obtenir un écran d’affichage pour affichages à cristaux liquides de grande qualité d’image où à la fois les variations de couleur et les variations de luminance sont faibles.
PCT/JP2005/019164 2004-10-13 2005-10-12 Plaque guide de lumière et procédé de fabrication de ladite plaque WO2006041195A1 (fr)

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JP2008107376A (ja) * 2006-10-23 2008-05-08 Citizen Electronics Co Ltd 薄型導光板及びその成形方法
JP2015507346A (ja) * 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 バックライトライトガイド

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TWI612348B (zh) * 2008-02-07 2018-01-21 Sony Corp 導光板及導光板之製造方法、以及液晶顯示裝置
US20120170310A1 (en) * 2011-01-05 2012-07-05 Qualcomm Mems Technologies, Inc. Light guide with uniform light distribution

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JPH10133023A (ja) * 1996-10-30 1998-05-22 Mitsubishi Chem Corp 面光源装置
JP2000221328A (ja) * 1999-01-29 2000-08-11 Nippon Zeon Co Ltd 導光板
JP2001154028A (ja) * 1999-12-01 2001-06-08 Enplas Corp 導光板、サイドライト型面光源装置及び液晶表示装置
JP2003109417A (ja) * 2000-12-12 2003-04-11 International Manufacturing & Engineering Services Co Ltd 面光源装置

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JPH10133023A (ja) * 1996-10-30 1998-05-22 Mitsubishi Chem Corp 面光源装置
JP2000221328A (ja) * 1999-01-29 2000-08-11 Nippon Zeon Co Ltd 導光板
JP2001154028A (ja) * 1999-12-01 2001-06-08 Enplas Corp 導光板、サイドライト型面光源装置及び液晶表示装置
JP2003109417A (ja) * 2000-12-12 2003-04-11 International Manufacturing & Engineering Services Co Ltd 面光源装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008107376A (ja) * 2006-10-23 2008-05-08 Citizen Electronics Co Ltd 薄型導光板及びその成形方法
JP2015507346A (ja) * 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 バックライトライトガイド

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JPWO2006041195A1 (ja) 2008-05-22
KR20070084193A (ko) 2007-08-24

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