WO2003104713A1 - 面光源装置および液晶ディスプレイ装置 - Google Patents
面光源装置および液晶ディスプレイ装置 Download PDFInfo
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- WO2003104713A1 WO2003104713A1 PCT/JP2003/007118 JP0307118W WO03104713A1 WO 2003104713 A1 WO2003104713 A1 WO 2003104713A1 JP 0307118 W JP0307118 W JP 0307118W WO 03104713 A1 WO03104713 A1 WO 03104713A1
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- Prior art keywords
- light
- light source
- source device
- light guide
- reflector
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0065—Manufacturing aspects; Material aspects
Definitions
- the present invention relates to a surface light source device and a liquid crystal display device using the same, and more particularly, to a technique for reducing the weight of the surface light source device, and a liquid crystal display suitably using the surface light source device as a backlight optical system.
- a technique for reducing the weight of the surface light source device and a liquid crystal display suitably using the surface light source device as a backlight optical system.
- transmissive liquid crystal display devices have been widely used as monitors for personal computers and display devices such as thin TVs.
- a planar lighting device on the back of a liquid crystal element, that is, A backlight is provided.
- the backlight has a function of converting a linear light source such as a cold cathode discharge tube into planar light.
- a light source is provided just below the back of the liquid crystal element, or a light source is installed on the side, and the light is planarized using a light-transmitting light guide such as an acrylic plate.
- the one that obtains a surface light source by converting (side light method) is typical.
- An optical element composed of a prism array, a diffusion sheet, etc. is arranged on the light emitting surface, and a light reflector made of expanded polyester or the like is arranged on the opposite side of the light emitting surface to obtain desired optical characteristics. .
- the sidelight method is disclosed in, for example, Japanese Patent Application Laid-Open Nos. 61-91987 and 63-62014.
- a sidelight method that can make the backlight thin, and it is preferable to use a liquid crystal display device such as a portable personal computer.
- Display devices often use sidelight-type backlights.
- an object of the present invention is to provide a surface light source device that is lightweight and does not easily damage the light guide. It is another object of the present invention to provide a lightweight liquid crystal display device having high backlight stability.
- a surface light source device comprising: a light source; and a light reflector disposed on a surface side opposite to the light emitting surface; wherein the light guide has a polyolefin resin as a main component, and the light reflector also has a polyolefin resin.
- the surface light source device is characterized in that no substantial scratches occur on the surface of the light guide when it is reciprocated 10 times with a width of 5 cm at a speed of 2.5 cm / sec while pressing with According to It has been found that the above object can be achieved.
- the light guide constituting the surface light source device of the present invention may have a pencil hardness of 3 B to 5 H on the surface facing the light reflector and a density of 0.7 to 1.5 g / cm 3 . preferable. Further, it is preferable that the light guide be composed mainly of a cyclic polyolefin (particularly one having a cycloalkane structure or a cycloalkene structure in the main chain) as a polyolefin resin.
- the light reflector constituting the surface light source device of the present invention preferably includes at least a layer stretched in one axial direction. Further, the light reflector preferably has a pencil hardness of 5 H or less on a surface facing the light guide, and a porosity of 5 to 50%. Further, the optical reflector preferably has a 2% strain compressive stress in the thickness direction of 300 to 300 gf / cm 2 .
- the present invention also provides a liquid crystal display device using the above-described surface light source device as backlight light source means.
- FIG. 1 is a schematic sectional view of a surface light source device according to one embodiment of the present invention. Detailed description of the invention
- the surface light source device of the present invention is a light guide having at least one side end as a light incident surface, and one surface as a light emitting surface; a light source arranged near a side end of the light guide; It consists of a light reflector arranged on the surface side opposite to the light emitting surface.
- the surface light source device of the present invention is characterized in that even if the light guide and the light reflector constituting the device rub against each other, the light guide is hardly damaged.
- a light reflector with a plane of 1.5 cm square is prepared, and the reflecting surface is placed on the surface of the light guide facing the light reflector. If the non-light-emitting surface of the light guide is not substantially damaged when it is reciprocated 10 times with a width of 5 cm at a speed of 2.5 cm / sec while pressing with 1 35 g Z cm 2 It has the following characteristics.
- “substantially no scratches occur” means that the surface of the light guide is observed at a magnification of 10 times using an optical microscope SZX12 manufactured by Olympus Optical Co., Ltd.
- the sum of the observed wound lengths is less than 2 mm.
- the total length of the flaw is preferably 1 mm or less, more preferably 0.5 mm or less, and most preferably no flaw is observed.
- the surface light source device of the present invention is used in a liquid crystal display device or the like, even if the light guide and the light reflector rub against each other due to vibrations during use, the light guide is used. Does not hurt the body. Therefore, the surface light source device of the present invention is extremely useful as a stable backlight of a liquid crystal display device, and has high practicability.
- the light guide constituting the surface light source device of the present invention contains a polyolefin-based resin as a main component.
- polyolefin-based resin cyclic polyolefin; ethylene-based resin such as linear low-density polyethylene, high-density polyethylene, and medium-density polyethylene; propylene-based resin; polymethyl-1-pentene, and the like can be used. Among them, it is preferable to use a cyclic polyolefm.
- Cyclic polyolefin is a polyolefin having an alicyclic structure in the main chain.
- the alicyclic structure of the main chain include a cycloalkane structure and a cycloalkene structure.
- Specific examples of the cyclic polyolefin include a norbornene-based polymer, a monocyclic cyclic olefin-based polymer, a cyclic conjugated gen-based polymer and a hydrogenated product thereof, a vinyl alicyclic hydrocarbon polymer and a hydrogenated product thereof, Preferred examples include an addition polymer of a cyclic olefin monomer and ethylene.
- the light guide is mainly composed of polyolefin-based resin, the amount of polio Refuin resin contained in the light guide is preferably 8 0-1 0 0 wt 0/0, 9 0-1 0
- the content is more preferably 0% by weight, particularly preferably 95 to 100% by weight.
- the light guide can contain various components other than the polyolefin-based resin as long as the function thereof is not excessively impaired.
- an inorganic pigment and / or an organic filler can be appropriately contained in the light guide for adjusting the light transmittance.
- the amount of the inorganic fine powder and the organic or inorganic filler contained in the light guide is preferably 0 to 20% by weight, more preferably 0 to 10% by weight, and more preferably 0 to 5% by weight. It is particularly preferred that there is.
- heavy calcium carbonate, light calcium carbonate, calcined tarry, silica, diatomaceous earth, tanolek, my power, synthetic my power, sericite, kaolinite, titanium oxide, barium sulfate, alumina, etc. are used. can do. Among them, it is preferable to use heavy calcium carbonate, light calcium carbonate, and barium sulfate.
- the organic filler it is preferable to select a resin having a different compatibility from the polyolefin resin, which is a main component of the light guide.
- a resin having a different compatibility from the polyolefin resin, which is a main component of the light guide.
- polyethylene terephthalate, polybutylene terephthalate, polycarbonate, nylon-16, nylon-16,6, a homopolymer of cyclic olefin, a copolymer of cyclic olefin and ethylene, etc. having a melting point of 120 ° (: up to 300 ° (:) or those having a glass transition temperature of from 120 ° C. to 280 ° C.
- a polyester resin is used as the polyolefin resin of the light guide.
- the melting point of the organic filler is polystyrene, polycarbonate, nylon-16, nylon-16,6, polymethylene-1-pentene, a homopolymer of cyclic olefin, or a copolymer of cyclic olefin and ethylene.
- those having a glass transition temperature of from 120 ° C to 300 ° C or a glass transition temperature of from 120 ° C to 280 ° C can be preferably used.
- one of the above inorganic fine powders or organic fillers may be selected and used alone, or two or more may be selected and used in combination.
- inorganic fine powder and organic filler You can mix and use.
- the light guide can be manufactured by kneading and molding the above-mentioned polyolefin-based resin or a resin composition containing the polyolefin-based resin and an additional component.
- a kneading means a single-screw kneader, a twin-screw kneader, a roll, an eder, or the like can be used.
- the molding method for example, extrusion molding, injection molding, calendar molding, inflation molding, press molding, blow molding, or a combination of these techniques can be used. Among these, it is particularly preferable to use an injection molding method.
- the shape of the light guide can be appropriately determined according to the purpose of use and the mode of use of the surface light source device of the present invention. Usually, it is formed into a plate.
- the light guide used in the surface light source device of the present invention preferably has a pencil hardness of 3B to 5H on the surface facing the light reflector, and more preferably 3B to F. If the pencil hardness exceeds 5H, the light reflector tends to be scratched. Further, if the pencil hardness is less than 3 B, the light guide tends to be damaged when manufacturing or using the surface light source device.
- the “pencil hardness” as used herein means a value measured by a method described in JIS-K-5 401-69 under a load of 10 g.
- Light guide used in the surface light source device of the present invention has a density of 0. 7 ⁇ 1. 5 gZc m 3 der Rukoto are preferred, and more preferably 0.8 to 1.3. If the density exceeds 1.5 g Zcm 3 , the surface light source device tends to be heavy, which tends to hinder the weight reduction of the surface light source device. If the density is less than 0.70 gZcm 3 , the light guide tends to be easily deformed by external force or the like.
- the “density” as used herein means a value measured in accordance with JI SP-8118.
- a dot shape may be formed on a specific portion of any surface of the light guide for light control.
- As a forming method molding, engraving, printing and the like can be used.
- Light reflector
- the light reflector constituting the surface light source device of the present invention contains a polyolefin-based resin as a main component.
- Polyolefin resins include linear low-density polyethylene and high-density polyethylene.
- Ethylene resins such as tylene and medium density polyethylene; propylene resins; polymethyl 11-pentene; ethylene monocyclic olefin copolymers and the like can be used.
- the propylene-based resin include propylene homopolymer and propylene as a main component, and c-olefin such as ethylene, 1-butene, 1-hexene, 1-heptene, 4-methyl-1-pentene and the like. Copolymers can be used.
- the stereoregularity is not particularly limited, and isotactic or syndiotactic and those exhibiting various degrees of stereoregularity can be used.
- the copolymer may be a binary, ternary or quaternary system, and may be a random copolymer or a block copolymer.
- propylene resins it is preferable to use a propylene homopolymer and a propylene copolymer having a melting point of 140 ° C. or more.
- the light reflector contains a resin having a melting point of less than 140 ° C, the molten sheet is adhered to the cooling port when the molten sheet is cooled by the cooling rolls during extrusion molding of the light reflector, and light reflection occurs. There is a tendency that scratches and uneven whitening occur on the surface of the body and optical characteristics are easily impaired.
- the amount of the polyolefin-based resin contained in the light reflector is preferably 30 to 99% by weight, and more preferably 35 to 97% by weight.
- the light reflector can contain various components other than the polyolefin-based resin as long as the function thereof is not excessively impaired.
- the light reflector may contain an inorganic pigment and Z or an organic filler as appropriate.
- the amount of the inorganic fine powder and Z or the organic filler contained in the light reflector is preferably 1 to 70% by weight, more preferably 3 to 65% by weight. If the amount of the inorganic fine powder and / or the organic filler is more than 70% by weight, the surface strength of the light reflector tends to decrease. If the amount is less than 1%, blocking tends to occur.
- the details of the inorganic fine powder and the organic filler that can be used for the light reflector are the same as those mentioned in the description of the light guide.
- the light reflector constituting the surface light source device of the present invention may further include a stabilizer, A stabilizer, dispersant, lubricant and the like may be added.
- the stabilizer examples include sterically hindered phenol-based, phosphorus-based and amine-based stabilizers in the range of 0.001 to 1% by weight, and sterically hindered amines, benzotriazole-based and benzophenone-based light stabilizers. 0.001 to 1% by weight, dispersant of inorganic fine powder (for example, silane coupling agent), higher fatty acid such as oleic acid and stearic acid, metal test, polyacrylic acid, polymethacrylic acid or salts thereof In an amount of 0.01 to 4% by weight.
- inorganic fine powder for example, silane coupling agent
- higher fatty acid such as oleic acid and stearic acid
- metal test polyacrylic acid, polymethacrylic acid or salts thereof
- polyacrylic acid polymethacrylic acid or salts thereof
- the light reflector constituting the surface light source device of the present invention may have a single-layer structure or a two-layer structure of a base material layer and a surface layer, and may include a front surface layer and a back surface layer on the front and back surfaces of the base material layer. Or a multi-layer structure having another resin film layer between the base material layer and the front surface layer and between the Z or back surface layer. When having a structure of two or more layers, it is preferable that all the layers contain a polyolefin-based resin.
- the light reflector preferably includes at least a layer stretched in one axial direction, in order to impart stiffness to the light reflector and increase the weight and improve the reflectivity by making the interior porous.
- the number of stretching axes is 1 axis, 2 axes for 1 layer structure, 1 axis Z 1 axis, 1 axis Z 2 axis, 2 axis Z 1 axis for 2 layer structure, 1 axis / "1 axis 2 axis for 3 layer structure , 1-axis / 2-axis Z 1-axis, 2-axis No 1-axis / axis, 1-axis Z 2-axis / 2-axis, 2-axis 2-axis / 1-axis, etc. Any number can be combined.
- the stretching method is not particularly limited, and various known methods can be used. For example, it is possible to use a method such as longitudinal stretching using a peripheral speed difference between roll groups, transverse stretching using a tenter oven, rolling, and simultaneous biaxial stretching using a combination of a tenter oven and a linear motor.
- the stretching ratio is not particularly limited, and is appropriately selected depending on the purpose of use and use of the surface light source device, the characteristics of the resin, and the like.
- a propylene homopolymer or a copolymer thereof among the polyolefin-based resins if the film is stretched in one direction, it is preferably stretched about 2 to 25 times, and preferably stretched 3 to 20 times. Is more preferred.
- biaxial stretching it is preferable to stretch by 9 to 80 times in area ratio, and 30 to 80 times. More preferably, it is stretched 60 times. Furthermore, heat treatment at a high temperature can be performed if necessary.
- the stretching is preferably performed at a temperature equal to or higher than the glass transition temperature of the non-crystalline portion and equal to or lower than the melting point of the crystalline portion.
- the specific stretching temperature can be appropriately selected within a known temperature range suitable for the resin to be selected.
- thermoplastic resin when stretching a thermoplastic resin, it is optimal to stretch at a temperature lower by 2 to 60 ° C than the melting point of the resin.
- the resin is a propylene homopolymer (melting point: 155-167 ° C), it is 95-: 165 ° C, and when the resin is high-density polyethylene (melting point: 121--134 ° C). It is preferable to stretch at 61 to 132 ° C.
- the stretching speed is preferably selected within the range of 20 to 35 OmZ.
- a resin composition containing an inorganic fine powder and / or an organic filler is stretched, fine cracks are generated on the film surface, and fine pores are generated inside the film.
- the holes improve the light reflectance, and preferably act when adjusting the compression modulus in the thickness direction or reducing the weight.
- the thickness of the stretched resin film is preferably from 50 to 500; zm, more preferably from 80 to 353 ⁇ .
- the light reflector has a structure of two or more layers
- methods such as casting, extrusion lamination, and dry lamination can be used for laminating layers such as a stretched film layer and a non-stretched film layer.
- the method of forming the resin film constituting the light reflector is not particularly limited, and various known methods can be used. Specific examples include cast molding for extruding molten resin into a sheet using a single-layer or multilayer ⁇ die or I-die connected to a screw-type extruder, calender molding, rolling molding, inflation molding, thermoplastic molding. Removal of the solvent or oil after casting or force rendering of a mixture of the resin and the organic solvent oil, molding from a solution of the thermoplastic resin and removal of the solvent, and the like can be mentioned.
- the shape of the light reflector used in the present invention is not particularly limited. Usually, it is sheet-shaped, but other shapes can be used according to the purpose of use and conditions of use.
- the pencil hardness of the surface of the light reflector facing the light guide used in the present invention is preferably 5H or less, more preferably 3H or less, and particularly preferably 1H or less. If the pencil hardness exceeds 5H, the surface of the light guide tends to be damaged when manufacturing or using the surface light source device.
- the porosity of the light reflector is preferably 5 to 50%, more preferably 10 to 45%, and particularly preferably 15 to 40%. If the porosity exceeds 50%, the strength of the light reflector tends to decrease. If the porosity is less than 5%, it tends to hinder the weight reduction of the surface light source device.
- the “porosity” in the present specification means a value calculated according to the following equation (1).
- ⁇ Represents the true density
- ⁇ represents the density after stretching (JIS- ⁇ -8118). Unless the material before stretching contains a large amount of air, the true density is approximately equal to the density before stretching.
- the density after stretching is obtained by obtaining the basis weight (gZm 2 ) of the light reflector and dividing by the thickness ( ⁇ ) of the light reflector obtained by, for example, micrometer or electron microscope observation (basis weight / thickness).
- 2% strain compression stress in the thickness direction of the light reflector used in the present invention is in the range of 300 ⁇ 30 00 gf Zcm 2, more be in the range of from 350 to 2800 gf / cm 2 It is particularly preferably in the range of 400 to 2500 g cm 2 .
- the 2% strain compressive stress in the thickness direction is less than 300 gf Zcm 2 , the light reflector tends to have a crack. Further, when the 2% strain compressive stress in the thickness direction exceeds 3000 gf Zcm 2 , the surface of the light guide tends to be easily damaged when manufacturing or using the surface light source device.
- the “2% strain compressive stress in the thickness direction” referred to in the present invention is a value measured by the following method. is there.
- a compression unit was attached to the tensile tester Autograph AGS—5 k ND (manufactured by Shimadzu Corporation), compressed at a compression speed of 1 mm / min, and strained by 2% with the CCD laser displacement sensor LK3100 (manufactured by Keyence Corporation). The value obtained by measuring the compressive stress at the time of observation with a tensile tester.
- 2% strain means a state in which the displacement amount when the light reflector is compressed is 2% of the thickness of the light reflector before compression.
- the surface light source device of the present invention can be manufactured using the light guide and the light reflector formed by the above method.
- the surface light source device of the present invention is a side light type surface light source device.
- FIG. 1 shows a specific configuration example of the surface light source device of the present invention.
- the upper surface of the light guide (2) is a light emitting surface, and the left side is a light incident surface.
- a light reflector (1) is arranged on the surface of the light guide (2) opposite to the light emitting surface, and a light source (3) is arranged near the light incident surface of the light guide (2). I have. The light emitted from the light source enters the light guide from the light incident surface, and exits from the light emitting surface including the light reflected by the light reflector.
- the light reflector (1) is arranged so as to reflect light into the light guide (2) and efficiently emit light from the light emitting surface.
- the light reflector (1) covers the entire surface of the light guide opposite to the light-emitting surface, but covers a part of the light guide in consideration of the purpose and mode of use. It can also be.
- the light source (3) used for the surface light source device of the present invention can be appropriately selected from those usually used for a surface light source device.
- a typical light source is a linear light source such as a cold cathode lamp.
- a diffusion sheet may be provided on the light emitting surface of the surface light source device of the present invention.
- the material of the diffusion sheet include a cyclic polyolefin, an ethylene-based resin, a propylene-based resin, and a polyester resin.
- the thickness of the diffusion sheet is 50-500 / m And more preferably 70 to 30 ⁇ .
- the surface light source device of the present invention is lighter than conventional products because the light reflector (1) and the light guide (2) are mainly composed of polyolefin resin. In addition, even if the light reflector and the light guide rub against each other due to vibration or the like, the light guide is less likely to be damaged, and thus has the advantage of high stability as a light source.
- a liquid crystal display device can be further manufactured.
- a liquid crystal display device refers to an electro-optical effect of liquid crystal molecules, that is, an optical anisotropy (refractive index anisotropy), an orientation, and the like.
- the display is performed using a liquid crystal cell, which is an array of optical shutters, driven by changing the alignment state of the liquid crystal and changing the light transmittance and reflectance.
- the liquid crystal display device is configured by, for example, stacking a diffusion sheet, a lens film, a brightness enhancement film, a polarizing plate, an optical compensator, a liquid crystal cell, an optical compensator, and a polarizer on the light emitting surface of the surface light source device. .
- transmissive simple matrix drive super twisted nematic mode transmissive active matrix drive twisted nematic mode, transmissive active matrix drive in-plane switching mode, transmissive active matrix drive multi-domain A liquid crystal display device of a virtual car line mode or the like can be used.
- a liquid crystal display device using the surface light source device of the present invention as backlight light source means, it is possible to obtain a device which is essentially high in brightness but lighter than the backlight light source means of conventional liquid crystal display devices. be able to.
- PP 1, HDPE, composition consisting of heavy calcium carbonate and titanium dioxide as filler (B); PP 2, HDPE, composition consisting of heavy calcium carbonate and titanium dioxide as filler (A) and (C) was melt-kneaded at 250 ° C using three separate extruders.
- the weight composition of each composition was as shown in Table 2. After that, it is supplied to one co-pressing die, (A) and (C) are laminated on both sides of (B) in the die, extruded into a sheet, and cooled to about 60 ° C with cooling rolls for lamination (AZB / C) was obtained.
- the laminate was reheated to 145 ° C, it was stretched in the longitudinal direction at the magnification shown in Table 2 using the difference in peripheral speed between a large number of roll groups, then annealed at 160 ° C, and the ears were stripped. It was lit to obtain a light reflector as a multilayer resin stretched film.
- a cyclic polyolefin manufactured by Zeon Corporation, trade name: Zeonor 1060 R was used.
- PP, HDPE, composition consisting of heavy calcium carbonate and titanium dioxide as filler (B); PP 2, HDPE, composition consisting of heavy calcium carbonate and titanium dioxide as filler (A) and ( C) were melt-kneaded at 250 ° C using three separate extruders.
- the weight composition of each composition was as shown in Table 2. After that, it is supplied to one co-pressing die, (A) and (C) are laminated on both sides of (B) in the die, extruded into a sheet, and cooled to about 60 ° C with cooling rolls for lamination (AZB / C) was obtained.
- the surface layer (A) is a surface that comes into contact with the light guide when assembling the liquid crystal display.
- Example 3 Using the obtained light reflector and the light guide described in Example 1, a surface light source device was manufactured in the same manner as in Example 1.
- Example 3 Using the obtained light reflector and the light guide described in Example 1, a surface light source device was manufactured in the same manner as in Example 1.
- compositions (A) and (C) composed of PP2, HDPE, heavy calcium carbonate as a filler, and titanium dioxide were melt-kneaded at 250 ° C using separate extruders.
- the weight composition of each composition was as shown in Table 2. Then, it is extruded into a sheet and laminated on the front and back sides of the stretched film composed of the composition (B) obtained in the above step, with the configuration shown in Table 2, and then cooled by cooling rolls to about 60 ° C. (AZBZC) was obtained.
- the laminate was reheated to about 150 ° C. and stretched in the transverse direction by a tenter at a magnification shown in Table 2. Then, after annealing at 160 ° C., it was cooled to 60 ° C., and the ears were slit to obtain a light reflector as a multilayer resin stretched film.
- the surface layer (A) is a surface that comes into contact with the light guide when assembling the liquid crystal display.
- Example 4 Using the obtained light reflector and the light guide described in Example 1, a surface light source device was manufactured in the same manner as in Example 1.
- Example 4 Using the obtained light reflector and the light guide described in Example 1, a surface light source device was manufactured in the same manner as in Example 1.
- Example 4 Using the obtained light reflector and the light guide described in Example 1, a surface light source device was manufactured in the same manner as in Example 1.
- PP, HDPE composition composed of light calcium carbonate and titanium dioxide as filler (B); PP 2, HDPE, composition composed of light calcium carbonate and titanium dioxide as filler (A) and (C)
- the weight composition of each composition was as shown in Table 2. After that, it is supplied to one co-pressing die, (A) and (C) are laminated on both sides of (B) in the die, extruded into a sheet, and cooled to about 60 ° C with cooling rolls for lamination (A / BZC) was obtained.
- the surface layer (A) is a surface that comes into contact with the light guide when assembling the liquid crystal display.
- Example 5 Using the obtained light reflector and the light guide described in Example 1, a surface light source device was manufactured in the same manner as in Example 1.
- Example 5 Using the obtained light reflector and the light guide described in Example 1, a surface light source device was manufactured in the same manner as in Example 1.
- PP1, HDPE a composition composed of barium sulfate and titanium dioxide as a filler (B); PP2, HDPE, a composition composed of barium sulfate and titanium dioxide as a filler (A) and (C), respectively
- the mixture was melt-kneaded at 250 ° C using a single extruder.
- the weight composition of each composition was as shown in Table 2. After that, it is supplied to one co-pressing die, (A) and (C) are laminated on both sides of (B) in the die, extruded into a sheet, and cooled to about 60 ° C with cooling rolls to laminate. (AZB / C) was obtained.
- the surface layer (A) is a surface that comes into contact with the light guide when assembling the liquid crystal display.
- a commercially available white polyester film (trade name: E60L, manufactured by Toray Industries, Inc.) was used as the light reflector.
- the density and true density of the stretched film were measured according to JIS—P—8118, and were determined by the above equation (1).
- Example 1 97 (a) 2.5 0.5 29 6 (a) 60 5 97 (a) 2.5 0.5 1/168/1 8.0 1.0 8.00 8.0 45
- Example 2 70 (a) 29.5 0.5 61 6 (a) 30 3 97 (a) 2.5 0.5 1/168/1 4.2 8.5 0.49 35.7 43
- Example 3 55 (b) 44.5 0.5 71 6 (b) 20 3 55 (b) 44.5 0.5 41/168/41 4.2 8.5 0.49 35.7
- Comparative Example 1 White
- the surface light source device when the surface light source device is manufactured or when the surface light source device is used by being incorporated into a liquid crystal display device, no scratch occurs even if the light guide and the light reflector are rubbed by vibration or the like. Further, according to the present invention, a surface light source device and a liquid crystal using the same are provided.
- the weight of the device can be reduced.
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003242095A AU2003242095A1 (en) | 2002-06-06 | 2003-06-05 | Surface light source device and liquid crystal display device |
EP03730829.3A EP1515084B1 (en) | 2002-06-06 | 2003-06-05 | Surface light source device and liquid crystal display device |
US11/003,732 US7004612B2 (en) | 2002-06-06 | 2004-12-06 | Planar light source device and liquid-crystal display device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002165622A JP4143338B2 (ja) | 2002-06-06 | 2002-06-06 | 面光源装置および液晶ディスプレイ装置 |
JP2002-165622 | 2002-06-06 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/003,732 Continuation US7004612B2 (en) | 2002-06-06 | 2004-12-06 | Planar light source device and liquid-crystal display device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003104713A1 true WO2003104713A1 (ja) | 2003-12-18 |
Family
ID=29727603
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/007118 WO2003104713A1 (ja) | 2002-06-06 | 2003-06-05 | 面光源装置および液晶ディスプレイ装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7004612B2 (ja) |
EP (1) | EP1515084B1 (ja) |
JP (1) | JP4143338B2 (ja) |
CN (1) | CN100492128C (ja) |
AU (1) | AU2003242095A1 (ja) |
WO (1) | WO2003104713A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006195453A (ja) * | 2004-12-17 | 2006-07-27 | Yupo Corp | 光反射体およびそれを用いた面光源装置 |
EP1837686A1 (en) * | 2004-12-17 | 2007-09-26 | Yupo Corporation | Light reflector and surface light source device |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US7660040B2 (en) * | 2005-05-17 | 2010-02-09 | E. I. Du Pont De Nemours And Company | Diffuse reflective article |
US7632000B2 (en) * | 2005-05-25 | 2009-12-15 | Samsung Electronics Co., Ltd. | Backlight assembly and liquid crystal display device having the same |
KR100816126B1 (ko) * | 2006-11-24 | 2008-03-21 | 재 동 윤 | 반사판 제조방법 및 반사판 |
JP2009128647A (ja) * | 2007-11-26 | 2009-06-11 | Hitachi Displays Ltd | 液晶表示装置 |
US20110075071A1 (en) * | 2009-09-25 | 2011-03-31 | Tpo Displays Corp. | Method for manufacturing a light guide for a backlight module in a lcd module |
DE102012213819A1 (de) | 2012-08-03 | 2014-05-22 | Leica Microsystems (Schweiz) Ag | Verwendung einer Flächenlichtquelle zur Auflichtbeleuchtung in einem Mikroskop |
JP6293415B2 (ja) * | 2013-02-25 | 2018-03-14 | 恵和株式会社 | ライトガイドフィルム、超薄型液晶バックライトユニット及び携帯型コンピュータ |
JP6203513B2 (ja) * | 2013-03-28 | 2017-09-27 | 恵和株式会社 | ライトガイドフィルム、バックライトユニット、携帯型コンピュータ及びライトガイドフィルムの製造方法 |
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JPH07287110A (ja) * | 1994-04-15 | 1995-10-31 | Mitsui Toatsu Chem Inc | 液晶表示装置バックライトユニット部の光反射シート |
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EP1424571A4 (en) * | 2001-08-06 | 2008-10-29 | Yupo Corp | LIGHT REFLECTOR |
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2002
- 2002-06-06 JP JP2002165622A patent/JP4143338B2/ja not_active Expired - Fee Related
-
2003
- 2003-06-05 CN CNB03817460XA patent/CN100492128C/zh not_active Expired - Fee Related
- 2003-06-05 AU AU2003242095A patent/AU2003242095A1/en not_active Abandoned
- 2003-06-05 WO PCT/JP2003/007118 patent/WO2003104713A1/ja active Application Filing
- 2003-06-05 EP EP03730829.3A patent/EP1515084B1/en not_active Expired - Lifetime
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2004
- 2004-12-06 US US11/003,732 patent/US7004612B2/en not_active Expired - Fee Related
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JPH07230004A (ja) * | 1993-12-21 | 1995-08-29 | Mitsui Toatsu Chem Inc | 液晶表示装置のバックライトユニット用光反射体 |
JPH07287110A (ja) * | 1994-04-15 | 1995-10-31 | Mitsui Toatsu Chem Inc | 液晶表示装置バックライトユニット部の光反射シート |
EP0724181A2 (en) | 1995-01-27 | 1996-07-31 | MITSUI TOATSU CHEMICALS, Inc. | Light reflective sheet and light reflector using it |
JP2001074940A (ja) * | 1999-06-30 | 2001-03-23 | Jsr Corp | 導光板 |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006195453A (ja) * | 2004-12-17 | 2006-07-27 | Yupo Corp | 光反射体およびそれを用いた面光源装置 |
EP1837686A1 (en) * | 2004-12-17 | 2007-09-26 | Yupo Corporation | Light reflector and surface light source device |
EP1837686A4 (en) * | 2004-12-17 | 2009-11-18 | Yupo Corp | LIGHT REFLECTOR AND DEVICE PRODUCING SURFACE LIGHT |
US8542443B2 (en) | 2004-12-17 | 2013-09-24 | Yupo Corporation | Light reflector and planar light source device |
Also Published As
Publication number | Publication date |
---|---|
US20050174508A1 (en) | 2005-08-11 |
EP1515084B1 (en) | 2013-09-18 |
CN100492128C (zh) | 2009-05-27 |
AU2003242095A1 (en) | 2003-12-22 |
US7004612B2 (en) | 2006-02-28 |
EP1515084A4 (en) | 2005-08-10 |
JP4143338B2 (ja) | 2008-09-03 |
CN1671992A (zh) | 2005-09-21 |
EP1515084A1 (en) | 2005-03-16 |
JP2004014268A (ja) | 2004-01-15 |
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