WO2007058060A1 - Plaque de guidage de lumiere - Google Patents

Plaque de guidage de lumiere Download PDF

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Publication number
WO2007058060A1
WO2007058060A1 PCT/JP2006/321263 JP2006321263W WO2007058060A1 WO 2007058060 A1 WO2007058060 A1 WO 2007058060A1 JP 2006321263 W JP2006321263 W JP 2006321263W WO 2007058060 A1 WO2007058060 A1 WO 2007058060A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
light guide
fine particles
light source
Prior art date
Application number
PCT/JP2006/321263
Other languages
English (en)
Japanese (ja)
Inventor
Takeo Kuroki
Satoru Hirota
Original Assignee
Asahi Kasei Chemicals Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asahi Kasei Chemicals Corporation filed Critical Asahi Kasei Chemicals Corporation
Priority to JP2007545186A priority Critical patent/JP5137581B2/ja
Priority to CN2006800431345A priority patent/CN101313175B/zh
Publication of WO2007058060A1 publication Critical patent/WO2007058060A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors

Definitions

  • the present invention relates to an office automation device such as a personal computer or a word processor, a liquid crystal display device used for various liquid crystal monitors (for example, a panel monitor or a television monitor) for displaying an image signal, and illumination of indoor and outdoor spaces.
  • the present invention relates to a light source plate suitable for a surface light source display device or a signboard used in the device.
  • Transparent thermoplastic resin especially methallyl resin, in particular, has been used for many lighting applications because of its excellent light transmission and mechanical properties. It is suitably used as a material for the light guide plate or diffusion plate of the source device.
  • This surface light source device is broadly classified into two types: a so-called direct type in which a diffusion plate is sandwiched between a light source (cold cathode tube) and a liquid crystal unit, and an edge light type in which a light source is arranged on the side end surface of the light guide plate.
  • Liquid crystal display devices represented by large-sized liquid crystal televisions of 21 inches or larger are mainly under the direct method, whereas edge light systems are used for surface light source devices for liquid crystal televisions of smaller sizes and liquid crystal monitors for personal computers. Is often used.
  • the mechanism of the edge light type surface light source device is as follows. Light diffusion gradation processing such as dot printing is performed on one side of the light guide plate, and a light source is arranged on the side end surface of the light guide plate. The light incident on the side surface of the plate travels while being totally reflected in the light guide plate, changes its direction by the light diffusion gradation process on the surface of the plate, and the light is emitted from the opposite surface.
  • the edge light system has the feature that the surface light source device can be made thin and compact. However, the number of light sources that can be arranged is limited due to its structure, so that the luminance as a surface light source device is lower than in the direct type.
  • liquid crystal display devices have been developed that are bright and have good color reproducibility even with the edge-light method, which demands products with higher image quality while being thin and power-saving.
  • edge-light method which demands products with higher image quality while being thin and power-saving.
  • surface emitting devices with high brightness and small color unevenness.
  • Patent Document 1 Japanese Patent Laid-Open No. 145485: Patent Document 1
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2004-351649
  • a light guide plate is prepared by dispersing fine particles in advance in a thermoplastic resin so as to prevent the fine particles from agglomerating during polymerization.
  • Patent Document 4 Japanese Patent Laid-Open No. 2005-181632 discloses a method for increasing the brightness by optimizing the particle size distribution of fine particles.
  • Patent Document 1 Japanese Patent Laid-Open No. 4 145485
  • Patent Document 2 JP 2000-113708 A
  • Patent Document 3 Japanese Patent Laid-Open No. 2004-351649
  • Patent Document 4 Japanese Unexamined Patent Application Publication No. 2005-181632
  • the fine particles selected according to the selection criteria for the fine particles are those that contribute to the improvement of the brightness.
  • An object of the present invention is to provide a light guide plate that has high luminance and little color unevenness and light output unevenness.
  • the present inventors have included a predetermined amount of a light guide plate having a color tone unevenness of a certain amount or less, in particular, a specific amount of titanium dioxide fine particles having a specific primary particle size distribution.
  • the light guide plate of the present invention was completed by using the transparent thermoplastic resin composition possessed.
  • the obtained light guide plate efficiently scatters incident light to the exit surface side and suppresses the scattering of blue light with a short wavelength of visible light, thereby improving color unevenness and further emitting light.
  • the present inventors have found that the luminance can be increased, and have completed the present invention.
  • the present invention has the following configuration.
  • a light guide plate for an edge light type surface light source device which is made of a transparent thermoplastic resin containing fine particles and has a light source disposed on a side end surface of the plate, and when one side of the plate is used as a light emitting surface, Side end surface force on which the light source is disposed on the back surface
  • Light source force Light diffusion treatment having a dullion is applied in the direction of moving away, and three of 25 luminance measurement points on the light exit surface are applied.
  • the color unevenness ( ⁇ Ylmax-min) which is the difference between the maximum value (Ylmax) and the minimum value (Ylmin) of the yellowness (YI) obtained from the stimulus value (XYZ), is 20 or less.
  • the fine particles are titanium dioxide fine particles having an average primary particle diameter of 0.2 to 0.3 m, and 0.01 to 20 ppm of titanium dioxide fine particles are contained in the transparent thermoplastic resin composition.
  • thermoplastic resin composition comprises a transparent thermoplastic resin composition containing 0.01 to 4 ppm of titanium dioxide fine particles in the transparent thermoplastic resin composition.
  • the ratio (D90ZD10) of 90% cumulative average particle size (D90) to 10% cumulative average particle size (D10) in terms of volume of the titanium dioxide fine particles is 5.0 or less. 4.
  • At least one of the light emitting surface and the back surface thereof is formed by arranging semicircular circular arcs that are connected and arranged so that the connected circular arcs are substantially perpendicular to the side end surfaces.
  • the cross-sectional shape of each semi-cylinder is such that the ratio (RZP) of the radius of curvature (R) to the pitch (P) of the semi-cylinder is 0.6 to 2.0.
  • RZP ratio of the radius of curvature
  • P pitch
  • thermoplastic resin is one selected from a methacrylic resin, a polycarbonate resin, and a cyclic polyolefin resin.
  • the light guide plate of the present invention has a high luminance due to the increased luminous efficiency of incident light with light source power.
  • light emission unevenness that is, a phenomenon in which the emitted light in the vicinity of the light source is large and the emitted light in the central portion is not too small is unlikely to occur.
  • the bluish color is strong near the light source and the yellow color is strong in the center, and there is no uneven color tone. Accordingly, it is possible to provide a light guide plate suitable for a display device used for various monitors such as a panel monitor and a television monitor for displaying an image signal, a display device used for a lighting device for indoor and outdoor spaces, a signboard, and the like.
  • FIG. 1 is an explanatory view of a portion where arcs of semicircular cylinders formed on the surface of a light guide plate are connected.
  • FIG. 2 shows a method for evaluating luminance in an edge light type surface light source device using the light guide plate of the present invention.
  • FIG. 3 is an explanatory diagram showing measurement points when measuring the luminance of the light guide plate of the present invention.
  • thermoplastic resin constituting the light guide plate examples include a metataryl resin, a polycarbonate resin, a cyclic olefin-based resin, a styrene-based resin, and an amorphous polyester.
  • Preferred are methallyl resin, polycarbonate resin, and cyclic olefin-based resin, and more preferably methacrylic resin.
  • the methacrylic resin can be obtained by copolymerizing 70% by weight or more of methyl methacrylate or ethyl acetate and a monomer having copolymerizability with methyl methacrylate or ethyl methacrylate.
  • Monomers that are copolymerizable with these include butyl methacrylate, ethyl methacrylate, methyl methacrylate, propyl methacrylate, cyclohexyl methacrylate, methacrylic acid phenol, and 2-ethylhexyl methacrylate.
  • Methacrylic acid esters methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, acrylic acid phenol, 2-ethyl hexyl acrylate, acrylic acid esters, methacrylic acid, acrylic acid, etc. Of unsaturated acids. Note that the methacrylic resin is not limited to these. Further, the production method is not limited at all.
  • the polycarbonate resin a polymer derived from a divalent phenol compound represented by bisphenol A is used.
  • the production method of the polycarbonate resin is not particularly limited, and well-known and commonly used methods such as a phosgene method, a transesterification method or a solid phase polymerization method can be mentioned.
  • the cyclic olefin fin resin is a polymer having a cyclic olefin skeleton in a polymer chain, such as norbornene cyclohexane, or a copolymer containing these, and belongs to an amorphous thermoplastic resin.
  • the manufacturing method is not particularly limited.
  • cyclic olefin fin resins mainly composed of norbornene JP-A-60-168708, JP-A-62-252406, JP-A-2-133413, JP-A-63-145324
  • the resin described in JP-A-63-264626, JP-A-1-240517, JP-B-57-8815 and the like can be used.
  • a soft polymer may be added.
  • an olefin-based soft polymer such as ⁇ -olefin linker, an isobutylene-based soft polymer composed of isobutylene, a gen-based soft polymer such as conjugated jean such as butadiene or isoprene, or a cyclic olefin such as norbornene or cyclopentene.
  • a cyclic olefin-based soft polymer, an organic polysiloxane-based soft polymer, a, j8-soft polymer composed of an unsaturated acid and a derivative thereof, an unsaturated alcohol and amine, an acyl derivative thereof, or a soft polymer capable of acetal force examples thereof include polymers of epoxy compounds and fluorine rubber.
  • the styrene-based resin is a homopolymer or copolymer having styrene as an essential component, or a polymer blend in which such a polymer and other resin and force can be obtained.
  • polystyrene resin AS resin which is a copolymer resin of acrylonitrile and styrene, and MS resin which is a copolymer resin of methacrylic acid ester and styrene are preferable.
  • transparent reinforced polystyrene in which rubber is distributed in the styrene-based resin phase can also be preferably used.
  • the method for producing the styrene-based resin is not particularly limited, and those produced by a well-known and commonly used method can be used.
  • Amorphous polyester includes ethylene glycol, propylene glycol, 1, 4 butane diol, neopentyl glycol, hexamethylene glycol and other aliphatic glycols, cyclohexane dimethanol and other alicyclic glycols, and bisphenol.
  • Aromatic dihydroxy compounds such as 1,3 bis (2-hydroxyethoxy) benzene, 1,4 bis (hydroxyethoxy) benzene, or two or more dihydroxy compounds selected from these units, and Aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, 2, 6 naphthalene dicarboxylic acid, aliphatic dicarboxylic acids such as oxalic acid, adipic acid, sebacic acid, succinic acid, undecadicarboxylic acid, hexahydroterephthalic acid, etc. Selected from alicyclic dicarboxylic acids, or two or more of these Among the polyesters units and mosquito ⁇ et forming a noncrystalline resin.
  • the method for producing the amorphous polyester is not particularly limited, and those produced by a well-known and commonly used method can be used.
  • Commercially available brands that are readily available as amorphous polyesters include KODA R PETG or PCTA, which are Eastman Kodak products.
  • fine particles dispersed in the light guide plate of the present invention known fine particles such as acid aluminum and titanium dioxide can be used. Of these, titanium dioxide fine particles having an average primary particle diameter in the range of 0.24 m to 0.3 m are preferable. Within this range, the light source to the light guide plate The incident light is scattered by the fine particles, so that a phenomenon in which the emitted light color tone is different between the vicinity of the light source and the central portion of the plate, that is, so-called uneven color tone hardly occurs. In addition, there is little light loss due to back reflection. Furthermore, the light source power can also efficiently scatter incident light to the exit surface side.
  • Titanium diacid titanium has high brightness, so even if the concentration relative to transparent thermoplastic resin is relatively low, there is a feature that high brightness can be obtained, but even if the particle size is too large or too small, the color unevenness becomes severe There is a tendency. If the particle diameter falls outside the above range and becomes less than or equal to 0., the relatively short wavelength, blue, and light are scattered by the fine particles in the visible light wavelength range, resulting in increased color unevenness on the light exit surface. There is a tendency.
  • the particle size is 0 or more, the light scattering effect may be lowered, and the amount of added fine particles must be increased in order to increase the brightness of the light guide plate.
  • the amount of light that passes through the fine particles increases, and the light that has passed through the fine particles changes its color before transmission because the fine particles themselves absorb light of the visible light wavelength. Color unevenness increases.
  • the amount of fine particles dispersed in the transparent thermoplastic resin is preferably 0.01 to 20 ppm force S, more preferably 0.75 or more to the weight of the transparent thermoplastic resin.
  • LOppm more preferably 0.1 to 4ppm. If the amount of fine particles is within the range of 0.01 ppm to 20 ppm, for example, even in a relatively large liquid crystal display device of 15 inches or more, light scattering gradation processing should not be applied to the back surface of the exit surface! / However, the light emitted from the light source has a uniform light output distribution on the entire exit surface where there is no difference between the luminance in the vicinity of the light source and the luminance at the farthest position from the light source.
  • the light source power will not be darkened at the farthest part, and the light output distribution on the light emitting surface should be properly balanced. Can do. Furthermore, when the proportion of fine particles is 20 ppm or less, it is possible to suppress the color tone distribution of the outgoing light within the outgoing surface where the change in the color tone near the light source of the light guide plate is small due to scattering.
  • the particle size distribution of the fine particles is sharp when the ratio of the 90% cumulative average particle size (D90) to the 10% cumulative average particle size (D10) (D90ZD10) is 5.0 or less in terms of volume. It is preferable that The closer the D90ZD10 is to 1, the sharper the particle size distribution, and each particle size is closer to the average particle size (D50). More preferably 3.5 or less, even more preferably 3.0 or less It is.
  • D10 becomes smaller and D90ZD10 becomes larger, the color tone unevenness in the exit surface tends to become larger.
  • D90 becomes larger and D90ZD10 becomes larger the scattering efficiency tends to deteriorate, and the brightness enhancement effect of the fine particles may be reduced.
  • it is 3.5 or less, more preferably 3.0 or less.
  • the cumulative average particle size referred to here was obtained from the cumulative distribution in terms of volume. The average particle size at which the cumulative volume was 90% was D90, and the average particle size at which the cumulative volume was 10% was D10.
  • the particle size distribution D90ZD10 is 5.0 or less, more preferably 3.5 or less, even more preferably 3.0 or less, and the average primary particle size is 0.24 / ⁇ ⁇ to 0.3 m.
  • a light guide plate containing 0.01 to 20 ppm, more preferably 0.05 to: LOppm, and still more preferably 0.1 to 4 ppm of fine particles within the range has the effect of improving luminance, suppressing color tone unevenness, and suppressing light emission unevenness. Especially high.
  • the shape of the fine particles is not particularly limited, such as a spherical shape, a spherical shape, a scale shape, a cubic shape, and an indefinite shape. Of these, spherical is preferable.
  • the crystal structure of titanium diacid-titanium is not particularly limited to forces including, for example, a rutile type and an anatase type.
  • the light guide plate of the present invention has a light diffusion gradation on the back surface of the exit surface.
  • the light diffusion process is to correct the angle of the light so that a sufficient amount of the light incident on the entrance surface reaches the exit surface.
  • the size gradually increases from the edge of the light guide plate surface to the center, or from one end to the other end (the light source is also directed to the farthest part of the light source).
  • the shape of the light guide plate of the present invention is basically a plate shape, but may be a shape obtained by shaping the plate surface.
  • By shaping the plate surface it is possible to remove the so-called dot image in which only the light diffusion gradation appears to shine, and to further increase the light emission luminance of the light guide plate.
  • the shaping process is performed on at least one of the light entrance surface and the back surface of the exit surface. .
  • shape of shaping for example, semicircular arcs are connected, that is, the cross section
  • shape of shaping for example, semicircular arcs are connected, that is, the cross section
  • substantially semi-cylindrical shape in which substantially semi-circular cylinders are connected to each other, and a substantially semi-cylindrical shape with a ridge line extending substantially perpendicular to the light incident surface.
  • the substantially semicircular shape of the semi-cylindrical cross section is a part of an arc or an elliptical arc, and preferably the radius of curvature (R) and the semi-cylindrical row pitch (P) shown in Fig. 1 are used.
  • the cross-sectional shape with a ratio force (RZP) in the range of 0.6 to 1.75 is also desirable. More preferably, it is 0.6-1.5, More preferably, it is 0.7-1.3.
  • the heights (H) of the substantially semicircular cylinders are preferably all the same, but the heights may be somewhat different as long as the difference in height is within 20%.
  • the shaping process is formed at least on the back surface of the light emitting surface, a sufficient light emission luminance improving effect can be obtained, but it is more preferable if it is also formed on the light emitting surface.
  • the method of shaping the light guide plate is not particularly limited! /, For example, a method of directly covering the light guide plate by etching, cutting by cutting, laser processing, etc .; A method of heat-pressing the surface of the light guide plate using a die or the like having a lens pattern formed by a blade cutting, laser processing, etc., applying an active energy ray-curable resin on the light guide plate and applying the active energy ray Examples thereof include a method of transferring a cylindrical lens array by mold hardening and a method of forming a light guide plate having a semi-cylindrical array by extrusion molding or injection molding. In particular, when extrusion is performed using an embossing roll having a lens array shape, stable mass production is possible.
  • a force S for which a known method can be used for example, the following method may be mentioned.
  • the above-mentioned transparent thermoplastic resin and the resin composition having fine particle force are formed into a sheet molded body by, for example, an extruder or a press molding machine, then cut into a predetermined size, and the cut surface is polished and guided.
  • a light plate is obtained, and if necessary, the cylindrical lens array is shaped and subjected to a light diffusion treatment.
  • Examples of a method for obtaining a rosin composition containing fine particles include the following methods.
  • a resin composition is produced by uniformly dispersing fine particles in an organic liquid using, for example, an ultrasonic generator.
  • the organic liquid mentioned here is a general organic liquid or transparent thermoplastic resin. It is not limited at all as long as it is a polymerizable monomer or the like constituting fat, and the light diffusing agent is difficult to dissolve and swell, and can be uniformly dispersed. Depending on the dispersion state of the fine particles, several kinds of organic liquids can be mixed in any proportion. Examples of the general organic liquid include ketones such as acetone and methyl ethyl ketone, aromatics such as xylene and toluene, and alcohols such as methanol and ethanol.
  • the transparent thermoplastic resin is a methacrylic resin, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, methacrylate methacrylate
  • Methacrylic acid esters such as 2-ethylhexyl methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, acrylic acid acrylic acid, 2-ethylhexyl acrylic acid, etc.
  • acrylic acid esters unsaturated acids such as methacrylic acid and acrylic acid.
  • the mixing ratio between the fine particles and the organic liquid can be arbitrarily determined in consideration of the dispersibility of the fine particles. If it says strongly, it is preferable that microparticles
  • fine-particles are the range of 0.001-80 mass parts with respect to 100 mass parts of organic liquids. Further, the mixing ratio of the dispersion liquid and the transparent thermoplastic resin can be arbitrarily determined in consideration of the handling property in the mixing extrusion process. In other words, it is preferably in the range of 0.001 to 10 parts by mass with respect to 100 parts by mass of the transparent thermoplastic resin!
  • a master batch pellet containing a high concentration of fine particles in the transparent thermoplastic resin composition is prepared, and diluted to a desired concentration with the transparent thermoplastic resin during molding. As a guide, it is better to disperse the fine particles into a transparent thermoplastic resin composition 5 to 300 times the fine particles to be finally included in the light guide plate to form pellets.
  • an ultrasonic generator used for dispersing particles is a commercially available A sonic cleaner or an ultrasonic stirrer can be used.
  • an ultrasonic cleaner having an ultrasonic frequency of 28 kHz to: LOOKHz is generally used.
  • the irradiation time by the ultrasonic generator can be arbitrarily set according to the dispersion state of the fine particles, but it is generally preferable to irradiate for 1 minute to 60 minutes.
  • an extruder In order to melt-knead and mold the resin composition thus obtained, for example, an extruder is generally used.
  • the above-mentioned rosin composition is mixed with a transparent thermoplastic rosin using, for example, a Henschel mixer, a super floater, a tumbler, and other well-known and conventional devices. be able to.
  • the extruder for melt-kneading the above mixture include a single-screw or twin-screw extruder, but it is preferable to use a twin-screw extruder because it can prevent secondary aggregation of fine particles.
  • the temperature of the extruder can be arbitrarily set according to the type of transparent thermoplastic resin used. For example, in the case of metataryl resin, it is around 180-260 ° C.
  • the light having a gradation is directed to the direction in which the side end surface force and the light source force are disposed away from the rear surface of the light emitting surface. It is necessary to apply diffusion treatment.
  • Examples of the light diffusion process include a dot or uneven shape that has a gradation pattern that gradually increases in area as the light source is placed, or a dot or uneven shape that is the same size is pitched as the light source power increases. There is a gradation notation that makes the width narrower.
  • the shape of the dots and irregularities can be round or square, and the size is about 0.1 to 2 Omm.
  • the method of the light diffusion treatment is not particularly limited, and the exit surface of the light guide plate is formed by screen printing using a white or translucent ink mixed with titanium oxide, silica, or the like after making a plate-like gradation pattern.
  • the light guide plate of the present invention needs to have a color tone unevenness (AYImax-min) of 20 or less.
  • Color tone irregularity refers to the following phenomenon. That is, the light incident on the side end surface of the light guide plate from the light source is scattered by the light diffusion process while repeating total reflection inside the light guide plate, and thus emits light from the exit surface beyond the critical angle. At that time, the blue light on the short wavelength side of the visible light castle is scattered by the transparent thermoplastic resin constituting the light guide plate, fine particles, and other necessary UV absorbers, mold release agents and anti-oxidation agents. Or it appears yellow when absorbed. This uneven color tone tends to increase as the distance on the light exit surface increases with the light source power.
  • the color unevenness (AYImax-min) is obtained as follows.
  • the light guide plate is set in an edge light type liquid crystal light source evaluation apparatus as shown in FIG.
  • a cold-cathode tube of 4 mm ⁇ (made by Harrison Electric Co., Ltd.) is used as the light source A in FIG. 2
  • a light guide plate having a length of 319 mm and a width of 241 mm is used as the light guide plate C
  • Ray White 75 (manufactured by Kimoto )
  • place two light diffusion sheets E (light diffusion sheet D121 (made by Gidden)) on top of the light guide plate C.
  • an inverter is connected to the cold-cathode tube, a voltage of 12V is applied to the inverter from a DC voltage stabilizer, and the lamp is lit for 30 minutes, and then a luminance meter (BM-7Fast: manufactured by Topcon) located at a distance of lm from the emission surface Measure the tristimulus values (X, Y, Z) at the measurement points obtained together with the brightness. As shown in Fig. 3, the whole emission surface is divided into 25 parts, total 5 parts in length and 5 parts in width, as shown in Fig. 3, and 25 points are measured at the center P1 to P25 of each section. The yellowness (YI) is calculated from the obtained tristimulus values (X, ⁇ , Z), and the difference between the maximum yellowness (YImax) and minimum yellowness (YImin) at the measurement point ( ⁇ YIMAX—MIN) And
  • the surface light source device power is excellent in the color reproducibility of light transmitted through the liquid crystal panel.
  • it is 10 or less, more preferably 8 or less.
  • an ultraviolet absorber can be added to the light guide plate of the present invention, if necessary, in order to prevent the light guide plate from being colored by the ultraviolet light generated by the light source. Due to the addition of UV absorber, the color light source device can be used even if the monitor is used for a long time. The upper color tone is always constant, and the occurrence of color tone unevenness can be further suppressed. Furthermore, it is possible to suppress a decrease in luminance and an increase in luminance unevenness.
  • Examples of the ultraviolet absorber include 2- (5-methyl-2-hydroxyphenyl) benzotriazole, 2- [2 hydroxy-3,5 bis ( ⁇ , ⁇ , dimethylbenzyl) phenol] base.
  • Benzotriazole UV absorbers such as Nzotriazolole, 2- (3,5 di-aminole-2-hydroxyphenol) benzotriazole, 2-Hydroxy-4-methoxybenzophenone, 2, 2, monodihydroxy 1-Methoxybenzophenone, 2-hydroxy-1 4-n-benzophenone UV absorbers such as oxyoxybenzophenone, salicylate, salicylic acid UV absorbers such as 4-t-butylphenol salicylate These may be used in combination of two or more.
  • the ultraviolet absorber should be added at a concentration of 30 to 2000 ppm, more preferably 80 to 500 ppm, based on the transparent thermoplastic lunar effect. When the amount of the ultraviolet absorber is within this range, a coloring suppression effect is ensured, and a luminance reduction and luminance unevenness suppression effect can also be obtained.
  • glycerin fatty acid esters such as glycerin monostearate, higher alcohols such as stearyl alcohol, and higher fatty acids such as stearic acid are added to the light guide plate of the present invention as a mold release agent, or phenol.
  • anti-oxidation agents such as thioether, thioether and phosphite. In that case, it is preferably used at a concentration of 5000 ppm or less, as long as it does not impair the object of the present invention.
  • the average primary particle diameter of the fine particles was measured by the following method.
  • the fine particles were photographed with a transmission electron microscope, and the major and minor diameters of the obtained particle images were measured.
  • the average value of the obtained measurement values is the particle size of one fine particle, and the average of the particle size of 100 fine particles The value was defined as the average primary particle size.
  • a cold cathode tube (made by Harrison Electric) with a diameter of 4 mm ⁇ is installed on both end faces of a light guide plate C with a length of 319 mm and a width of 24 lmm, and a light-reflective sheet D with a white length of 318 mm and a width of 240 mm.
  • two light diffusion sheets E (light diffusion sheet D121; made by Gidden) were placed on top of the light guide plate C.
  • a luminance meter (BM — 7FastZ viewing angle set to 1 degree) was installed at a position 0.5m away from the light exit surface after connecting the inverter to a cold cathode tube, applying a voltage of 12V from the DC voltage stabilizer to the inverter and lighting it for 30 minutes. Brightness measured at 25 points on the exit surface. As shown in Fig. 3, 25 points were divided into a total of 25 parts, 5 parts in length and 5 parts in width, and the center of each section was used as the measurement point. The average luminance was also calculated for the obtained measured value force.
  • the evaluation was performed in order to see the degree of unevenness in color tone, which is a phenomenon in which the bluish color near the light source is strong and the yellow color is strong in the part away from the light source power when the light source is placed on the light guide plate.
  • the yellowness (YI) is calculated by the following formula using the tristimulus values (X, Y, Z) of each measurement point obtained together with the luminance by the luminance meter, and the maximum of the measurement points is calculated.
  • the difference in yellowness (YImax)-minimum yellowness (YImin) ( ⁇ YIMAX – MIN) was defined as uneven color tone.
  • Formula for calculating yellowness (YI): Yellowness (YI) 100 (1.28X-1.06 ⁇ ) / ⁇
  • the luminance at the central point of the surface light emitting device at the measurement point P13 shown in Fig. 2 among the 25 divided measurement points is defined as the central luminance (luminance Center), and the central luminance (luminance Center) ) Is the maximum luminance (luminance max), the unevenness of light emission is set to ⁇ None '', and if there is the maximum luminance (luminance max) between the light source side of measurement points P6 to P10 and P16 to P20 and the center of the light guide plate, Unevenness S was “slightly”, and if there was maximum brightness (luminance max) on the light source side of measurement points P1 to P5 and P21 to P25, output unevenness was determined to be “large”.
  • Methyl methacrylate 79.9%, methyl acrylate 5.1% by weight, and ethylbenzen 15% by weight are added to a monomer mixture of 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclo 150 ppm hexane and 300 ppm n-octyl mercaptan were added and mixed uniformly.
  • This mixed solution was continuously supplied to a sealed pressure resistant reactor having an internal volume of 10 liters, and polymerized with stirring at an average temperature of 130 ° C. and an average residence time of 2 hours.
  • This resin was continuously sent to a storage tank connected to the reactor, and after removing volatile components under reduced pressure, it was continuously transferred to an extruder in a molten state.
  • a pellet was prepared in the same manner as in the preparation of the raw material pellet A, except that the average primary particle diameter of titanium dioxide was changed to 0.25 m.
  • the obtained methacrylic resin composition is referred to as raw material pellet B.
  • a pellet was prepared in the same manner as in the preparation of the raw material pellet A, except that the average primary particle diameter of titanium dioxide was changed to 0.045 ⁇ m.
  • the obtained methacrylic resin composition is referred to as raw material pellet C.
  • raw material pellet D In the preparation of the above raw material pellet A, the same procedure was performed except that, instead of titanium dioxide having an average primary particle size of 0.29 m, acid / aluminum having an average primary particle size of 0.5 / zm was used. A pellet was prepared. The obtained pellets contained lOOppm of aluminum oxide. This methacrylic resin composition is designated as raw material pellet D.
  • raw material pellet A In the preparation of the above raw material pellet A, the same procedure was performed except that, instead of titanium dioxide having an average primary particle size of 0.29 m, acid-aluminum having an average primary particle size of 0.27 / zm was used. A pellet was prepared. The obtained pellets contained lOOppm of aluminum oxide. This methacrylic resin composition is referred to as raw material pellet E.
  • a pellet was prepared in the same manner as in the preparation of the raw material pellet A, except that the average primary particle diameter of titanium dioxide was changed to 0.2 ⁇ m.
  • the obtained methacrylic resin composition is designated as raw material pellet F.
  • a pellet was prepared in the same manner as in the preparation of the raw material pellet A, except that the average primary particle diameter of titanium dioxide was changed to 0.4 ⁇ m.
  • the obtained methacrylic resin composition is referred to as raw material pellet G.
  • methacrylic resin ⁇ pellet was replaced with polycarbonate resin resin pellet (Teijin Chemicals: Panlite ZL-1250Y), and nitrogen was purged into the hopper with a 30mm ⁇ twin screw extruder (manufactured by Nakata).
  • pellets were produced in the same manner except that extrusion was performed at 260 ° C. while evacuating to 10 torr. Let the obtained polycarbonate resin composition be the raw material pellet K.
  • Raw material pellet A and methacrylic resin ex pellet were uniformly mixed by a tumbler at a mixing weight ratio of 1: 199.
  • the resulting mixed pellets were extruded at a temperature of 250 ° C using a 50mm ⁇ single-screw extruder with a T-die for the sheet, a polishing roll adjusted to 80 ° C, and an extrusion sheet forming machine with a pulling device.
  • an extruded plate having a width of 400 mm and a thickness of 6 mm and containing 0.5 ppm of titanium dioxide was obtained.
  • the resulting extruded plate was cut into a size of 241 mm in width and 319 mm in length using a circular saw, and the cut surface of the cut-out plate was cut using a precision polishing machine (PLA—Beauty: manufactured by Megalotech Co., Ltd.) Polished and then puffed to give a mirror finish.
  • PPA Precision Polishing machine
  • screen printing is performed on one side of the light guide plate to obtain a light diffusion layer. It was.
  • a light guide plate containing 2. Oppm of titanium dioxide was obtained in the same manner as in Example 1, except that the raw material pellet A was used and the mixing weight ratio with the methacrylic resin ex pellet was changed to 1:49.
  • the raw material pellet A was used, and the mixing weight ratio with the methacrylic resin oc pellet was changed to 1: 4.
  • a light guide plate containing 20. Oppm of titanium dioxide was obtained.
  • a light guide plate containing 2. Oppm of titanium dioxide was obtained in the same manner as in Example 1 except that the raw material pellet B was used and the mixing weight ratio with the methacrylic resin ⁇ pellet was changed to 1:49.
  • a light guide plate containing 4. Oppm of titanium dioxide was obtained in the same manner as in Example 1 except that the raw material pellet B was used and the mixing weight ratio with the methacrylic resin ⁇ pellet was changed to 1:24.
  • Raw material pellet G and cyclic olefin fin resin pellets (Nippon Zeon: ZENOOR 1060R) were mixed at a mixing weight ratio of 1:49, and the resulting mixed pellets were mixed into the hopper part using the same extrusion sheet molding machine.
  • Extruded plates containing 2. Oppm of titanium dioxide were obtained in the same manner except that extrusion was performed at a temperature of 250 ° C while purging with nitrogen.
  • Raw material pellets K and polycarbonate resin pellets (manufactured by Teijin Chemicals: Panlite / L-1250 Y) were mixed at a mixing weight ratio of 1:49 and extruded at a temperature of 260 ° C using the same extrusion sheet molding machine. Except that, an extruded plate containing 2. Oppm of titanium dioxide was obtained in the same manner.
  • a light guide plate containing 2. Oppm of acid aluminum was obtained in the same manner as in Example 1 except that the raw material pellet D was used and the mixing weight ratio with the methacrylic resin ex pellet was changed to 1:49.
  • Example 2 The same method as in Example 1 except that one side of the light guide plate was shaped with an embossing roll that was surface-covered with a lathe at a pitch of 100 m using a 1Z2 circular tip with a radius of curvature of 100 m. An extruded plate was obtained. After cutting out using a circular saw with a size of 241 mm in width and 319 mm in length so that the obtained cylindrical force is approximately perpendicular to the light incident surface, the cylindrical lens array is cut out of the cut surface of the cut plate. Polishing, puffing, and screen printing were performed in the same manner as in Example 1 to obtain a light guide plate.
  • Example 10 A method similar to that of Example 2 except that one side of the light guide plate was shaped with an embossing roll that was surface-covered with a lathe at a pitch of 100 m using a 1Z2 circular tip with a radius of curvature of 100 m. An extruded plate was obtained. The obtained extruded plate was processed in the same manner as in Example 8 to obtain a light guide plate.
  • One side of the light guide plate was shaped with an embossing roll that was surface-coated into a shape in which a cylindrical lens-shaped mountain with a curvature radius of 175 ⁇ m cut vertically into 1Z2 was connected at a pitch of 100 ⁇ m. Except for the above, an extruded plate was obtained in the same manner as in Example 1. The obtained extruded plate was processed in the same manner as in Example 8 to obtain a light guide plate.
  • Example 1 except that a 1Z2 circular tip with a radius of curvature of 100 m was used, and both sides of the light guide plate were shaped using two embossing rolls that were surface-covered with a lathe at a pitch of 100 m. Extruded plates were obtained in the same manner. The obtained extruded plate was processed in the same manner as in Example 8 to obtain a light guide plate.
  • a light guide plate was produced in the same manner as in Example 1 except that no titanium dioxide fine particles were used.
  • a light guide plate containing 100. Oppm of titanium dioxide was obtained in the same manner as in Example 1 except that the mixing weight ratio of the raw material pellet A and methacrylic resin a pellet was changed to 1: 0.
  • a light guide plate containing 2. Oppm of titanium dioxide was obtained in the same manner as in Example 1 except that the raw material pellet C was used and the mixing weight ratio with the methacrylic resin ⁇ pellet was changed to 1:49.
  • a light guide plate containing 20. Oppm of acid aluminum was obtained in the same manner as in Example 1 except that the raw material pellet D was used and the mixing weight ratio with the methacrylic resin ⁇ pellet was changed to 1: 4.
  • a light guide plate containing 12.5 ppm of acid aluminum was obtained in the same manner as in Example 1 except that the raw material pellet E was used and the mixing weight ratio with the methacrylic resin ⁇ pellet was changed to 1: 1.15. It was.
  • a light guide plate containing 2. Oppm of titanium dioxide was obtained in the same manner as in Example 1 except that the raw material pellet F was used and the mixing weight ratio with the methacrylic resin ⁇ pellet was changed to 1:49.
  • a light guide plate containing 2. Oppm of titanium dioxide was obtained in the same manner as in Example 1 except that the raw material pellet G was used and the mixing weight ratio with the methacrylic resin ⁇ pellet was changed to 1:49.
  • the light guide plate of Comparative Example 1 had a low average luminance because fine particles were not added.
  • the light guide plate of Comparative Example 4 had a large average primary particle size of 0.5 ⁇ m, and thus the output light unevenness and the color tone unevenness were strong.
  • the average primary particle diameter of aluminum oxide is 0.27 ⁇ m, but since the refractive index is lower than that of titanium dioxide, the scattering efficiency is small and the average luminance is low. In addition, it is unsuitable for a light guide plate for a display device such as a liquid crystal monitor with large color unevenness.
  • Comparative Example 6 the average primary particle size was as small as 0.2 m, so that it was unsuitable for a light guide plate for a display device such as a liquid crystal monitor with large color tone unevenness.
  • the average primary particle diameter was as large as 0.4 m, so that the color unevenness was large and the average luminance was low.
  • the present invention is used in office automation equipment such as personal computers and word processors, display devices used for displaying various image signals, such as panel monitors and television monitors, and lighting devices for indoor and outdoor spaces.
  • office automation equipment such as personal computers and word processors
  • display devices used for displaying various image signals such as panel monitors and television monitors
  • lighting devices for indoor and outdoor spaces.
  • a light guide plate suitable for a display device, a signboard or the like is preferably obtained.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Liquid Crystal (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

La présente invention concerne une plaque de guidage de lumière d'un dispositif à source lumineuse de surface de type à éclairage périphérique dans laquelle une source lumineuse est disposée sur une surface latérale de la plaque. Le guide lumineux est formé d'une résine thermoplastique transparente contenant des particules. La surface avant de la plaque de guidage de lumière sert de surface de sortie de lumière, et la surface arrière de la plaque de guidage de lumière est soumise à un traitement de diffusion de la lumière afin d'avoir une gradation à partir de la surface latérale dans une direction s'éloignant de la source lumineuse. La plaque de guidage de lumière se caractérise en ce que la variation de ton (ΔYImax-min) qui est la différence entre la valeur maximale (YImax) et la valeur minimale (YImin) de l'indice du jaune (YI) déterminée à partir des composantes trichromatiques (XYZ) dans le point de mesure de luminance lumineuse 25 sur la surface de sortie de lumière est de 20 ou moins.
PCT/JP2006/321263 2005-11-17 2006-10-25 Plaque de guidage de lumiere WO2007058060A1 (fr)

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Cited By (9)

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WO2009051203A1 (fr) * 2007-10-19 2009-04-23 Mitsubishi Rayon Co., Ltd., Guide de lumière, procédé de fabrication et dispositif à source lumineuse de surface l'utilisant
WO2011124412A1 (fr) 2010-04-08 2011-10-13 Evonik Röhm Gmbh Corps conducteur de lumière avec intensité d'éclairage élevée et transparence élevée
JP2012160314A (ja) * 2011-01-31 2012-08-23 Sumitomo Chemical Co Ltd 導光板用紫外線硬化型インクジェットインク及びこれを用いた導光板
WO2012111806A1 (fr) * 2011-02-18 2012-08-23 住友化学株式会社 Dispositif et procédé d'inspection, et procédé de fabrication utilisant ledit procédé d'inspection
DE102012205749A1 (de) 2012-04-10 2013-10-10 Evonik Industries Ag Werbeleuchtkasten mit seitlicher Hohlraumhinterleuchtung und spezieller Scheibe zur optimierten Lichtverteilung
US9411085B2 (en) 2012-05-24 2016-08-09 Fujifilm Corporation Light guide plate
WO2019172243A1 (fr) 2018-03-07 2019-09-12 三菱ケミカル株式会社 Composition de résine transparente, corps moulé en résine, écran protecteur de lampe, écran protecteur de lampe pour véhicule, écrans protecteurs de lampe en combinaison, et véhicule
JP2020007459A (ja) * 2018-07-09 2020-01-16 三菱エンジニアリングプラスチックス株式会社 ポリカーボネート樹脂組成物及び成形品
FR3086293A1 (fr) * 2018-09-26 2020-03-27 Arkema France Composition comprenant des particules diffusantes

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JPWO2011162306A1 (ja) * 2010-06-24 2013-08-22 東洋スチレン株式会社 スチレン系導光板
JP2012188503A (ja) * 2011-03-09 2012-10-04 Sumitomo Chemical Co Ltd 導光板用樹脂組成物および導光板
TWI510826B (zh) * 2013-04-09 2015-12-01 Chi Mei Corp 導光板、發光單元以及具有該發光單元的液晶顯示元件
CN107559623A (zh) * 2016-06-07 2018-01-09 程国中 一种led球泡灯灯罩的制备方法

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JPH1020124A (ja) * 1996-06-28 1998-01-23 Taiho Ind Co Ltd バックライト用導光板及びその製造方法
WO2002039153A1 (fr) * 2000-11-13 2002-05-16 Asahi Kasei Kabushiki Kaisha Guide de lumière et procédé de production de composition de résine thermoplastique transparente pour guide de lumière
JP2004351649A (ja) * 2003-05-27 2004-12-16 Mitsubishi Rayon Co Ltd 光散乱導光板の製造方法
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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009051203A1 (fr) * 2007-10-19 2009-04-23 Mitsubishi Rayon Co., Ltd., Guide de lumière, procédé de fabrication et dispositif à source lumineuse de surface l'utilisant
EP2556395B1 (fr) 2010-04-08 2017-10-18 Evonik Röhm GmbH Corps conducteur de lumière doté d'une haute intensité lumineuse et d'une plus grande transparence
WO2011124412A1 (fr) 2010-04-08 2011-10-13 Evonik Röhm Gmbh Corps conducteur de lumière avec intensité d'éclairage élevée et transparence élevée
KR101889990B1 (ko) * 2010-04-08 2018-08-20 에보니크 룀 게엠베하 높은 광 강도 및 높은 투명도를 갖는 광 도파체
CN102834752A (zh) * 2010-04-08 2012-12-19 赢创罗姆有限公司 具有高光强度和高透明性的光导体
KR20130040806A (ko) * 2010-04-08 2013-04-24 에보니크 룀 게엠베하 높은 광 강도 및 높은 투명도를 갖는 광 도파체
JP2013527968A (ja) * 2010-04-08 2013-07-04 エボニック レーム ゲゼルシャフト ミット ベシュレンクテル ハフツング 高い光強度および高い透明性を有する導光体
US10007048B2 (en) 2010-04-08 2018-06-26 Evonik Roehm Gmbh Light guide body having high luminous intensity and high transparency
JP2012160314A (ja) * 2011-01-31 2012-08-23 Sumitomo Chemical Co Ltd 導光板用紫外線硬化型インクジェットインク及びこれを用いた導光板
WO2012111806A1 (fr) * 2011-02-18 2012-08-23 住友化学株式会社 Dispositif et procédé d'inspection, et procédé de fabrication utilisant ledit procédé d'inspection
DE102012205749A1 (de) 2012-04-10 2013-10-10 Evonik Industries Ag Werbeleuchtkasten mit seitlicher Hohlraumhinterleuchtung und spezieller Scheibe zur optimierten Lichtverteilung
WO2013152911A1 (fr) 2012-04-10 2013-10-17 Evonik Industries Ag Caisson lumineux publicitaire avec un rétroéclairage latéral à cavité et une plaque de diffusion spéciale pour une répartition de la lumière optimisée
US9411085B2 (en) 2012-05-24 2016-08-09 Fujifilm Corporation Light guide plate
WO2019172243A1 (fr) 2018-03-07 2019-09-12 三菱ケミカル株式会社 Composition de résine transparente, corps moulé en résine, écran protecteur de lampe, écran protecteur de lampe pour véhicule, écrans protecteurs de lampe en combinaison, et véhicule
JPWO2019172243A1 (ja) * 2018-03-07 2020-04-16 三菱ケミカル株式会社 透明樹脂組成物、樹脂成形体、ランプカバー、車両用ランプカバー、コンビネーションランプカバー及び車両
JP2021091910A (ja) * 2018-03-07 2021-06-17 三菱ケミカル株式会社 透明樹脂組成物、樹脂成形体、ランプカバー、車両用ランプカバー、コンビネーションランプカバー及び車両
JP2021091911A (ja) * 2018-03-07 2021-06-17 三菱ケミカル株式会社 透明樹脂組成物、樹脂成形体、ランプカバー、車両用ランプカバー、コンビネーションランプカバー及び車両
JP2021101011A (ja) * 2018-03-07 2021-07-08 三菱ケミカル株式会社 透明樹脂組成物、樹脂成形体、ランプカバー、車両用ランプカバー、コンビネーションランプカバー及び車両
US11269130B2 (en) 2018-03-07 2022-03-08 Mitsubishi Chemical Corporation Transparent resin composition, resin molded body, lamp cover, lamp cover for vehicles, combination lamp cover, and vehicle
JP7231343B2 (ja) 2018-07-09 2023-03-01 三菱エンジニアリングプラスチックス株式会社 ポリカーボネート樹脂組成物及び成形品
JP2020007459A (ja) * 2018-07-09 2020-01-16 三菱エンジニアリングプラスチックス株式会社 ポリカーボネート樹脂組成物及び成形品
FR3086293A1 (fr) * 2018-09-26 2020-03-27 Arkema France Composition comprenant des particules diffusantes
WO2020064957A1 (fr) * 2018-09-26 2020-04-02 Arkema France Composition comprenant des particules de diffusion

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CN101313175A (zh) 2008-11-26
TWI348562B (fr) 2011-09-11
KR20080032208A (ko) 2008-04-14
CN101313175B (zh) 2010-07-14
JPWO2007058060A1 (ja) 2009-04-30
TW200730903A (en) 2007-08-16
JP5137581B2 (ja) 2013-02-06

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