WO2008047855A1 - Élément de source lumineuse de surface et son procédé de fabrication - Google Patents

Élément de source lumineuse de surface et son procédé de fabrication Download PDF

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Publication number
WO2008047855A1
WO2008047855A1 PCT/JP2007/070324 JP2007070324W WO2008047855A1 WO 2008047855 A1 WO2008047855 A1 WO 2008047855A1 JP 2007070324 W JP2007070324 W JP 2007070324W WO 2008047855 A1 WO2008047855 A1 WO 2008047855A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
light source
layer
control plate
source element
Prior art date
Application number
PCT/JP2007/070324
Other languages
English (en)
Japanese (ja)
Inventor
Hirofumi Tanabe
Ikuo Onishi
Original Assignee
Kuraray Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kuraray Co., Ltd. filed Critical Kuraray Co., Ltd.
Priority to JP2008539858A priority Critical patent/JPWO2008047855A1/ja
Publication of WO2008047855A1 publication Critical patent/WO2008047855A1/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
    • 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
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention relates to a surface light source element used for a personal computer, a computer monitor, a video camera, a television receiver, a car navigation system, and the like, and a method for manufacturing the same.
  • a transmissive display device typified by a liquid crystal panel is composed of a surface light source element (backlight) that emits light in a planar shape and a display panel in which pixels are arranged in a dot shape.
  • a surface light source element backlight
  • a halogen lamp, a reflector, a lens, or the like is combined to control the luminance distribution of the emitted light
  • a fluorescent tube is provided on the end surface of the light guide so that light from the fluorescent tube can be emitted. Examples include those emitted from a surface perpendicular to the end face, and those in which a fluorescent tube is provided directly under the light guide (direct type).
  • a surface light source element using a halogen lamp is mainly used in a liquid crystal projector that requires high luminance.
  • surface light source elements using light guides can be made thinner, so they are often used for direct-view liquid crystal ⁇ , personal computer displays, and so on.
  • the incident light control plate that has the functions of these sheets rather than arranging a prism sheet or a diffusion sheet on the exit surface side of the conventional light guide is used. This can be achieved by optically bringing a certain convex portion on the surface into close contact with the light guide through a fixed layer (see Patent Document 1).
  • the convex shape of the outgoing light control plate is determined in accordance with a desired viewing angle characteristic, and optical performance can be exhibited by arranging the light guide and the outgoing light control plate in parallel.
  • the top of the convex part has a curved surface shape! /, And it is flat! /, So it is suitable for close contact with the light guide!
  • Patent Document 1 Japanese Patent Laid-Open No. 2001-338507
  • Patent Document 2 Japanese Patent Laid-Open No. 2005-50789
  • Patent Document 3 Japanese Patent Laid-Open No. 2001-76521
  • the top of the convex portion is filled by affecting the thickness and hardness of the adhesive layer or the adhesive layer, and the adhesive width between the convex portion and the light guide If this is changed, the optical performance will be reduced.
  • An object of the present invention is to provide a surface light source element.
  • the present invention that solves the above-described problems is a light source, a reflector that reflects light from the light source, and an incident surface that is at least one end face that receives light from the light source and light reflected by the reflector. And a light guide having a light exit surface that is one of the main surfaces substantially perpendicular to the light entrance surface, and light from the light exit surface of the light guide is received by a convex portion on the light entrance surface.
  • a surface light source element comprising: an emitted light control plate that emits in a front surface direction; and a fixed layer that joins at least a part of the emission surface of the light guide and at least a part of an incident surface of the emission light control plate.
  • the emitted light control plate has at least one protrusion-shaped fixing portion at the top of at least a part of the convex portion, and at least a part of the fixing portion is inside the fixing layer. It is characterized by. [0009]
  • the present invention may also be characterized in that, in the surface light source element described above, the output light control plate has a top portion of the fixed portion having a flat portion parallel to an output surface of the light guide.
  • the present invention may be characterized in that a concave portion is provided around the fixed portion at the top of the convex portion.
  • the height of the fixing portion is in a range of 50% to 100% with respect to the thickness of the fixing layer in which the fixing portion is provided. It may be a feature.
  • the present invention is characterized in that, in the above surface light source element, the fixed portion of the convex portion of the emitted light control plate passes through the fixed layer. .
  • the present invention may be characterized in that, in the surface light source element described above, the fixed layer is a photocurable resin.
  • the fixed layer is provided between the support layer substantially parallel to the emission surface and the light control plate, and the support layer is the light guide. Being attached to your body! /, Specially!
  • the present invention is a method for manufacturing a surface light source element having no support layer, wherein the light exiting surface of the light guide is covered with a photocurable resin having fluidity, A coating process, an assembling step of embedding at least a part of the fixing portion of the outgoing light control plate in the front fixing layer, and a fixing layer that hardens the front fixing layer after the assembling step to form a fixing layer. It is characterized by including a process.
  • the present invention is a method for manufacturing a surface light source element having the above support layer, wherein the support layer is provided so as to cover at least a part of the exit surface of the light guide, A second assembly step in which at least a part of the fixed portion of the outgoing light control plate is embedded in the front fixed layer on the support layer; and after the second assembly step, the front fixed layer is cured to fix the fixed layer It is a manufacturing method characterized by including the fixing process.
  • the top of the fixed portion is a flat surface parallel to the exit surface of the light guide, it is possible to arrange the light guide and the output light control plate, which are important for ensuring optical performance, in parallel. Easier and better Since the alignment becomes easy, the production speed and yield are improved, which is advantageous for improving productivity.
  • the height of the fixing portion is in the range of 50% to 100% with respect to the thickness of the fixing layer, the bonding area is increased and high adhesive force is obtained, and at the same time, the fixing layer The convex part joined to the shape becomes the designed shape, and it becomes easy to maintain the optical performance.
  • the convex portion penetrates the fixed layer, the convex portion is not buried in the fixed layer, so that the light guide and the outgoing light control plate are joined at a certain distance, and the light guide is fixed to the fixed layer.
  • the light guide is fixed to the fixed layer.
  • the adhesiveness and hardness can be adjusted by photocuring, and the optical performance is maintained by the design of the convex portion joined to the fixed layer. Easy to do.
  • a support layer for joining the outgoing light control plate and the light guide a fixed layer can be provided in advance on the support layer, and by cutting out and bonding to a desired size, an appropriate position can be obtained. It becomes possible to fortune-telling.
  • productivity is improved by covering the light guide with a photocurable resin having fluidity, embedding the fixed portion of the outgoing light control plate in the fixed layer, and then curing the fixed layer. be able to.
  • a pressure necessary for adhesion can be applied by adhering the support layer provided with the front fixing layer to the light guide in the first assembly process, and the emission light control plate of the second assembly process can be applied.
  • the emission light control plate of the second assembly process can be applied.
  • FIG. 1 is a schematic cross-sectional view showing a partial cross-section of a surface light source element of the present invention.
  • FIG. 2 is a schematic sectional view showing a partial section of a conventional surface light source element.
  • FIG. 3 is an enlarged cross-sectional view showing an example of a convex shape in the surface light source element of the present invention. Explanation of symbols [0027] 1; end face; 2; light source; 3; light guide; 4; outgoing light control plate; 5;
  • FIG. 1 is a schematic sectional view showing a partial section of a surface light source element according to an embodiment of the present invention.
  • This surface light source element is composed of a light guide 3 provided with a light source 2 on the left and right end faces 1 side, and an emission light control plate 4 that controls the distribution of the emission angles of light emitted from the light guide 3. Yes.
  • the outgoing light control plate 4 is disposed on the light guide 3, and light incident on the incident surface 5 is emitted from the outgoing surface (light emitting surface of the surface light source element) 6.
  • a large number of convex portions 7 are formed on the incident surface 5 of the outgoing light control plate 4 in order to direct the light from the outgoing surface of the light guide 3 toward the front surface of the outgoing surface 6 of the outgoing light control plate 4.
  • the fixing portion 8 at the top of the convex portion 7 is buried in the fixed layer 9 provided on the light guide 3 so as to be in close contact with the exit surface of the light guide 3.
  • the light traveling in the opposite direction to the incident surface 1 side of the light guide is reflected around the light source 2 and travels to the incident surface 1 side of the light guide.
  • the light guide used in the surface light source element of the present invention includes an acrylic resin such as polymethylmethallate (PMMA), a polycarbonate resin, a polystyrene resin, a resin having excellent transparency such as a cycloolefin polymer, and the like.
  • PMMA polymethylmethallate
  • a polycarbonate resin such as polyethylene glycol dimethacrylate
  • a polystyrene resin such as polystyrene resin
  • a resin having excellent transparency such as a cycloolefin polymer, and the like.
  • a glass processed into a predetermined shape can be used.
  • use of PMMA is preferable in terms of lightness and transparency.
  • a processing method a method of cutting out from an extruded plate or cast plate or a melt molding method such as a hot press or injection molding is preferably used, but is not limited thereto.
  • examples of the fixing layer for optically joining the light guide and the outgoing light control plate include an adhesive, a pressure-sensitive adhesive, an adhesive, and a photocurable resin.
  • Light hardness from the aspect of sex A suitable adhesive is preferably used.
  • the pressure-sensitive adhesive include those based on an appropriate polymer such as rubber-based, acrylic-based, vinyl alkyl ether-based, silicone-based, polyester-based, polyurethane-based, polyether-based polyamide-based, or styrene-based polymer.
  • an acrylic pressure-sensitive adhesive based on a polymer mainly composed of an alkyl ester of acrylic acid or methacrylic acid is preferably used because transparency is excellent in terms of weather resistance and heat resistance.
  • the adhesive includes, for example, conductive inorganic particles such as silica, alumina, titanium zirconia, tin oxide, indium oxide, cadmium oxide and nonmony oxide, and organic particles such as a crosslinked or uncrosslinked polymer.
  • conductive inorganic particles such as silica, alumina, titanium zirconia, tin oxide, indium oxide, cadmium oxide and nonmony oxide
  • organic particles such as a crosslinked or uncrosslinked polymer.
  • suitable transparent particles may be contained to obtain a light diffusion type.
  • the support layer on which the fixed layer is provided includes a resin film having excellent transparency such as a polyester resin such as polyethylene terephthalate (PET), an acrylic resin such as PMMA, a polycarbonate resin, a polystyrene resin, and a cycloolefin polymer.
  • PET polyethylene terephthalate
  • acrylic resin such as PMMA
  • polycarbonate resin such as polycarbonate resin
  • polystyrene resin such as polystyrene resin
  • a cycloolefin polymer is preferred because of its handling and transparency.
  • the fixing layer dissolved in a solvent is coated on the support layer using a roll coater or a die coater, and then dried.
  • the support layer provided with the fixing layer on both sides can be adhered to the light guide by laminating.
  • the surface shape of the outgoing light control plate is a transparent base material using a stamper or a female die, etc. by a hot press method, a 2P method by ultraviolet spring curing, a casting method by thermal curing, an injection molding method, or the like. Can be formed on top.
  • a resin such as acrylic resin, polycarbonate resin, polystyrene resin, cycloolefin polymer, or glass is used. In the present invention, it is preferable to transfer the shape with a photocurable resin onto a transparent base material using an acrylic resin.
  • the photo-curable resin used for transfer to the substrate determines the optical performance of the produced outgoing light control plate, and is preferably selected as appropriate according to the desired performance.
  • a component of the photo-curable resin a monomer capable of radical polymerization or! /, An oligomer alone or a combination of two or more is normally used.
  • the mechanical strength, impact resistance, heat resistance, surface hardness, etc. required for the plate can be imparted.
  • Specific examples of components include aliphatic, alicyclic, and aromatic mono- or polyalcohols.
  • Ester-type (meth) atrelate obtained by the condensation reaction of styrene with acrylic acid or methacrylic acid is an isocyanate compound having two or more isocyanate groups in the molecule and a (meth) atariate containing a hydroxyl group or a thiol group.
  • the stamper used for producing the emission light control plate is, for example, a negative or positive photosensitive resin coated on a glass substrate, and the exposure of this photosensitive resin through a photomask, or laser drawing. It can be produced by exposing with an apparatus, developing, and applying electricity, and it can also be produced with IJ.
  • the preferred thickness of the outgoing light control plate is 0.1 mm to 3 mm, and the 0.1 mm to 0.5 mm finolem shape reduces the thickness of the device and reduces the stress that leads to reduced adhesion. The following effects can be obtained. 0.1. If it is less than 1 mm, it is preferable due to wrinkles when fixing to the light guide and a decrease in physical strength! If it exceeds 3 mm, the device will become heavy, which is preferable.
  • the convex portion provided in the outgoing light control plate in the present invention may be a two-dimensionally arranged lens array type in addition to a pattern like a one-dimensionally arranged lenticular lens! /.
  • fine surface irregularities may be directly transferred to the light output surface of the output light control plate, or a diffusion layer is provided by applying a diffusing agent liquid mixed with light-transmitting fine particles. May be.
  • the shape is a cone, Polygonal pyramid, polygonal column, cylinder, truncated cone, truncated pyramid, etc. are not particularly limited, but polygonal column, cylinder, circle with flat top A cylinder and a truncated cone in which the stress that the frustum and the truncated pyramid favor favorably work are particularly preferably used.
  • the position of the fixing portion may be provided at any position on the top portion, but it is preferably provided at the center of the top portion in order to maintain the plane of the outgoing light control plate and the light guide.
  • a concave portion 11 may be provided around the fixed portion 8 as shown in FIG.
  • the volume of the recess 11 is preferably substantially equal to the volume in which the fixing portion 8 is embedded in the fixing layer 9.
  • the height of the fixing portion provided on the top of the convex portion is preferably 50% or more if it is in the range of 50% to 100% with respect to the thickness of the fixing layer for fixing the fixing portion.
  • the bonding strength can be improved by increasing the bonding area as compared with the prior art.
  • it is 80% or more, it is easy to adjust the pressure to make the outgoing light control plate and the light guide parallel to each other, and the effect is particularly great when the top of the fixed portion is flat.
  • it is 95% or less it is more preferable because it is easy to control the uplift of the fixed layer by embedding the fixed portion in the front fixed layer.
  • Examples of the present invention and comparative examples for the present invention are shown below.
  • Examples and comparative examples were evaluated by peel strength.
  • a 50 mm width cut was made in the outgoing light control plate fixed to the light guide using a fixed layer, and the end of the outgoing light control plate was connected to a digital force gauge (manufactured by IMAD A). The load was measured by sandwiching it between clips and peeling it away from the light guide at 90 degrees.
  • the outline will be described with reference to FIG.
  • a PMMA light guide plate was used, and the emission surface 6 and its opposing surface were flat.
  • the outgoing light control plate 4 a PMMA film is used as a base material, and a stamper having a shape opposite to the convex portion 7 and the fixing portion 8 is coated with a photocurable resin, and then transferred onto the base material by UV curing.
  • a photocurable resin that becomes the fixing layer 9 by being cured with ultraviolet rays was used, and the photocurable resin was applied to the exit surface 6 of the light guide 3 to form a front fixing layer. Thereafter, the produced emission light control plate 4 was bonded to the light guide 3 through the fixed layer 9. Thereafter, the 90 ° peel strength of the outgoing light control plate 4 was measured and found to be 15.7 N / 50 mm.
  • the output light control plate 4 is connected to the light guide 3 via the fixed layer 9 in the same manner as in Example 1 except that the convex portion 7 of the output light control plate 4 does not have the fixing portion 8 but has a flat surface. Pasted together.
  • the 90 ° peel strength of the outgoing light control plate 4 was measured and found to be 7.8 N / 50 mm.

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

Abstract

L'invention concerne un élément de source lumineuse de surface comportant une source lumineuse (2), un réflecteur (10) permettant de réfléchir la lumière provenant de la source lumineuse (2), un corps de guide de lumière (3) comportant une surface d'incidence lumineuse qui est au moins une surface d'extrémité (1) qui reçoit la lumière provenant de la source lumineuse (2) et la lumière réfléchie du réflecteur, et comportant également une surface de sortie qui est l'une des surfaces principales sensiblement perpendiculaires à la surface incidente, une plaque de commande de lumière en sortie (4) destinée à recevoir, grâce à des protubérances (7) sur une surface incidente de la plaque, la lumière provenant de la surface de sortie du corps de guide de lumière (3) et émettant la lumière provenant d'une surface de sortie de la plaque vers la direction de face avant, ainsi qu'une couche de fixation (9) destinée à réunir ensemble au moins une partie de la surface de sortie du corps de guide de lumière (3) et au moins une partie de la surface incidente de la plaque de commande de lumière en sortie. La plaque de commande de lumière en sortie (4) possède au moins une ou plusieurs sections (8) de fixation qui dépassent aux sommets d'au moins certaines des protubérances (7), et au moins certaines des sections (8) de fixation se trouvent à l'intérieur de la couche de fixation (9). L'élément de source lumineuse de surface peut être fabriqué avec une productivité en augmentation et possède des performances optiques maintenues à un haut niveau, le degré et la force d'adhérence entre la plaque de commande de lumière en sortie (4) et le corps de guide de lumière (3) étant améliorés.
PCT/JP2007/070324 2006-10-19 2007-10-18 Élément de source lumineuse de surface et son procédé de fabrication WO2008047855A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008539858A JPWO2008047855A1 (ja) 2006-10-19 2007-10-18 面光源素子およびその製造方法

Applications Claiming Priority (2)

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JP2006285362 2006-10-19
JP2006-285362 2006-10-19

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WO2008047855A1 true WO2008047855A1 (fr) 2008-04-24

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JP2009244482A (ja) * 2008-03-31 2009-10-22 Furukawa Electric Co Ltd:The 光学機能部材
JP2009294240A (ja) * 2008-06-02 2009-12-17 Toppan Printing Co Ltd 光学シート、バックライトユニット、液晶表示装置及びディスプレイ装置
WO2011130155A1 (fr) * 2010-04-12 2011-10-20 3M Innovative Properties Company Empilement optique
WO2012138495A1 (fr) * 2011-04-04 2012-10-11 3M Innovative Properties Company Empilement optique comprenant un adhésif
WO2013051872A2 (fr) * 2011-10-04 2013-04-11 주식회사 엘엠에스 Dispositif de source lumineuse de surface
JP2014228652A (ja) * 2013-05-21 2014-12-08 大日本印刷株式会社 光制御シート
JP2017003999A (ja) * 2009-12-30 2017-01-05 スリーエム イノベイティブ プロパティズ カンパニー エネルギー効率の高い標識用の光偏向複合フィルム

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JP5059171B2 (ja) * 2009-07-06 2012-10-24 住友化学株式会社 光制御板、面光源装置及び透過型画像表示装置
TW201331645A (zh) * 2011-10-13 2013-08-01 Skc Haas Display Films Co Ltd 具有多刻面光輸入邊緣之導光膜

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Publication number Priority date Publication date Assignee Title
JP2009244482A (ja) * 2008-03-31 2009-10-22 Furukawa Electric Co Ltd:The 光学機能部材
JP2009294240A (ja) * 2008-06-02 2009-12-17 Toppan Printing Co Ltd 光学シート、バックライトユニット、液晶表示装置及びディスプレイ装置
JP2017003999A (ja) * 2009-12-30 2017-01-05 スリーエム イノベイティブ プロパティズ カンパニー エネルギー効率の高い標識用の光偏向複合フィルム
JP2019045878A (ja) * 2009-12-30 2019-03-22 スリーエム イノベイティブ プロパティズ カンパニー エネルギー効率の高い標識用の光偏向複合フィルム
KR20180058231A (ko) * 2010-04-12 2018-05-31 쓰리엠 이노베이티브 프로퍼티즈 컴파니 광 지향 필름
JP2018106196A (ja) * 2010-04-12 2018-07-05 スリーエム イノベイティブ プロパティズ カンパニー 光学積層体
CN102844686A (zh) * 2010-04-12 2012-12-26 3M创新有限公司 导光膜
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JP2013524299A (ja) * 2010-04-12 2013-06-17 スリーエム イノベイティブ プロパティズ カンパニー 光学積層体
JP2013529313A (ja) * 2010-04-12 2013-07-18 スリーエム イノベイティブ プロパティズ カンパニー 導光フィルム
KR102120839B1 (ko) * 2010-04-12 2020-06-09 쓰리엠 이노베이티브 프로퍼티즈 컴파니 광학 스택
KR20200022531A (ko) * 2010-04-12 2020-03-03 쓰리엠 이노베이티브 프로퍼티즈 컴파니 광학 스택
JP2019194991A (ja) * 2010-04-12 2019-11-07 スリーエム イノベイティブ プロパティズ カンパニー 導光フィルム
WO2011130155A1 (fr) * 2010-04-12 2011-10-20 3M Innovative Properties Company Empilement optique
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JP2014228652A (ja) * 2013-05-21 2014-12-08 大日本印刷株式会社 光制御シート

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