TWI719528B - Polarizer, polarizer and image display device - Google Patents

Polarizer, polarizer and image display device Download PDF

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TWI719528B
TWI719528B TW108123931A TW108123931A TWI719528B TW I719528 B TWI719528 B TW I719528B TW 108123931 A TW108123931 A TW 108123931A TW 108123931 A TW108123931 A TW 108123931A TW I719528 B TWI719528 B TW I719528B
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polarizer
image display
dyeing
dyed
display device
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TW202008016A (en
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望月政和
中田美惠
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日商日東電工股份有限公司
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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
    • 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
    • G02F1/133528—Polarisers

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

本發明提供可以實現設計性優異的影像顯示裝置的偏光件、偏光板和影像顯示裝置。本發明的偏光件具有染色部和非染色部。該非染色部形成在沿著偏光件的外緣的整個周圍。The present invention provides a polarizer, a polarizing plate, and an image display device that can realize an image display device with excellent design. The polarizing member of the present invention has a dyed part and a non-dyed part. The non-dyeing part is formed along the entire circumference of the outer edge of the polarizer.

Description

偏光件、偏光板及影像顯示裝置Polarizer, polarizer and image display device

發明領域 本發明涉及偏光件、偏光板及影像顯示裝置。更具體而言，涉及可以實現設計性優異的影像顯示裝置的偏光件、包含該偏光件的偏光板以及包含該偏光板的影像顯示裝置。Invention field The invention relates to a polarizer, a polarizer and an image display device. More specifically, it relates to a polarizing member capable of realizing an image display device with excellent designability, a polarizing plate including the polarizing member, and an image display device including the polarizing plate.

發明背景 偏光板用於手機和筆記型個人電腦(PC)等的各種影像顯示裝置。近年來，開發了具備攝像機和各種感測器的影像顯示裝置。作為這種影像顯示裝置中使用的偏光件，提出了將對應於攝像機的部分予以局部脫色的偏光件(專利文獻1)。最近，尋求不僅是功能而且設計性也優異的影像顯示裝置。例如提出了邊框部分更窄的影像顯示裝置、及顯示部分的階差更小(全平設計)的影像顯示裝置。現正尋求可因應這些高設計性相關要求的偏光件。 先行技術文獻 專利文獻Background of the invention Polarizers are used in various image display devices such as mobile phones and notebook personal computers (PCs). In recent years, video display devices equipped with cameras and various sensors have been developed. As a polarizer used in such an image display device, a polarizer in which a part corresponding to the camera is partially decolorized has been proposed (Patent Document 1). Recently, there is a demand for image display devices that are not only functional but also excellent in design. For example, an image display device with a narrower frame portion and an image display device with a smaller display portion (full-flat design) have been proposed. Now we are looking for polarizers that can meet these high design requirements. Advanced technical literature Patent literature

專利文獻1：日本特開2014-112238號公報Patent Document 1: Japanese Patent Application Publication No. 2014-112238

發明概要 發明所欲解決之課題 本發明是為了解決上述現有問題而作出的，其主要目的在於提供可以實現設計性優異的影像顯示裝置的偏光件、包含該偏光件的偏光板以及包含該偏光板的影像顯示裝置。 用以解決課題之手段Summary of the invention The problem to be solved by the invention The present invention is made in order to solve the above-mentioned existing problems, and its main purpose is to provide a polarizing member that can realize an image display device with excellent designability, a polarizing plate including the polarizing member, and an image display device including the polarizing plate. Means to solve the problem

本發明的偏光件具有染色部和非染色部。該非染色部形成在沿著該偏光件外緣的整個周圍。 在一個實施方式中，上述非染色部為脫色部。 在一個實施方式中，上述非染色部的寬度為1mm以上。 在本發明的另一個方案中，提供偏光板。本發明的偏光板具備上述偏光件。 在本發明的再另一個方案中，提供影像顯示裝置。該影像顯示裝置具備上述偏光板。 發明效果The polarizing member of the present invention has a dyed part and a non-dyed part. The non-dyeing part is formed along the entire circumference of the outer edge of the polarizing member. In one embodiment, the non-dyeing part is a decoloring part. In one embodiment, the width of the non-dyed part is 1 mm or more. In another aspect of the present invention, a polarizing plate is provided. The polarizing plate of the present invention includes the above-mentioned polarizer. In yet another aspect of the present invention, an image display device is provided. This image display device includes the above-mentioned polarizing plate. Invention effect

根據本發明，能夠提供可以實現設計性優異的影像顯示裝置的偏光件。本發明的偏光件具有染色部和非染色部，非染色部形成在沿著偏光件外緣的整個周圍。在該非染色部，能夠應用各種色彩而不受偏光件的顏色影響，因此能夠實現外緣部的設計多元化。此外，能夠防止偏光件妨礙影像顯示裝置所具備的攝像機和各種感測器的功能。因此，能夠更進一步高度發揮影像顯示裝置所具備的各種功能。進而，通過使用本發明的偏光件，能夠提供階差更小(平坦)的影像顯示裝置。According to the present invention, it is possible to provide a polarizer capable of realizing an image display device excellent in design. The polarizing member of the present invention has a dyed part and a non-dyeing part, and the non-dyeing part is formed along the entire circumference of the outer edge of the polarizing member. In the non-dyed part, various colors can be applied without being affected by the color of the polarizer, so that the design of the outer edge part can be diversified. In addition, it is possible to prevent the polarizer from interfering with the functions of the camera and various sensors included in the image display device. Therefore, the various functions of the image display device can be further utilized. Furthermore, by using the polarizer of the present invention, it is possible to provide an image display device with a smaller (flat) step difference.

具體實施方式 以下，針對本發明的實施方式進行說明，但本發明不限定於這些實施方式。detailed description Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to these embodiments.

A.偏光件 本發明的偏光件具有染色部和非染色部。該非染色部形成在沿著偏光件外緣的整個周圍。因此，能夠提供可以實現設計性更優異的影像顯示裝置的偏光件。進而，在搭載有各種感測器和攝像機等功能的影像顯示裝置中，也可防止妨礙這些功能，能夠更進一步發揮各種功能。A. Polarizing parts The polarizing member of the present invention has a dyed part and a non-dyed part. The non-dyed part is formed along the entire periphery of the outer edge of the polarizer. Therefore, it is possible to provide a polarizer capable of realizing an image display device with more excellent design. Furthermore, in an image display device equipped with various sensors, cameras, and other functions, it is possible to prevent these functions from being hindered, and it is possible to further exert various functions.

圖1是本發明一個實施方式的偏光件的俯視圖。圖示例的偏光件10具有染色部12和非染色部11。在圖示例中，偏光件10為矩形。圖示例中，在沿著偏光件10的外緣、即四邊的整個周圍形成有非染色部12。通過在沿著偏光件外緣的整個周圍形成非染色部12，能夠提供設計性更優異的影像顯示裝置。此外，智慧型手機和PC等高功能影像顯示裝置可以在邊緣部具備攝像機和感測器等。通過在沿著偏光件外緣的整個周圍形成有非染色部，可防止妨礙這些功能，能夠更進一步發揮各種功能。Fig. 1 is a plan view of a polarizer according to an embodiment of the present invention. The polarizer 10 illustrated in the figure has a dyed part 12 and a non-dye part 11. In the illustrated example, the polarizing member 10 is rectangular. In the example shown in the figure, the non-dyeing portion 12 is formed along the outer edge of the polarizer 10, that is, the entire circumference of the four sides. By forming the non-dyeing portion 12 along the entire periphery of the outer edge of the polarizer, it is possible to provide an image display device with more excellent design. In addition, high-performance video display devices such as smartphones and PCs can be equipped with cameras and sensors at the edges. By forming the non-dyed part along the entire periphery of the outer edge of the polarizer, it is possible to prevent these functions from being hindered, and it is possible to further exert various functions.

偏光件10可以根據所使用的用途等而設計成任意的合適形狀。作為偏光件10的形狀，例如可列舉出：矩形、圓形、菱形、異形等。The polarizer 10 can be designed in any suitable shape according to the intended use and the like. Examples of the shape of the polarizer 10 include a rectangular shape, a circular shape, a diamond shape, and a different shape.

偏光件代表性的是通過用碘等二色性物質染色樹脂薄膜來製造。作為形成樹脂薄膜的樹脂，可以使用任意合適的樹脂。優選使用聚乙烯醇系樹脂(以下稱為「PVA系樹脂」)。作為PVA系樹脂，例如可列舉出聚乙烯醇、乙烯-乙烯醇共聚物。聚乙烯醇通過使聚醋酸乙烯酯皂化來得到。乙烯-乙烯醇共聚物通過使乙烯-醋酸乙烯酯共聚物皂化來得到。PVA系樹脂的皂化度通常為85莫耳%以上且小於100莫耳%，優選為95.0莫耳%~99.95莫耳%，進一步優選為99.0莫耳%~99.93莫耳%。皂化度可以根據JIS K 6726-1994求出。通過使用這種皂化度的PVA系樹脂，可以得到耐久性優異的偏光件。在皂化度過高的情況下，存在發生凝膠化之虞。The polarizer is typically manufactured by dyeing a resin film with a dichroic substance such as iodine. As the resin forming the resin film, any appropriate resin can be used. It is preferable to use a polyvinyl alcohol-based resin (hereinafter referred to as "PVA-based resin"). Examples of PVA-based resins include polyvinyl alcohol and ethylene-vinyl alcohol copolymers. Polyvinyl alcohol is obtained by saponifying polyvinyl acetate. The ethylene-vinyl alcohol copolymer is obtained by saponifying an ethylene-vinyl acetate copolymer. The degree of saponification of the PVA-based resin is usually 85 mol% or more and less than 100 mol%, preferably 95.0 mol% to 99.95 mol%, and more preferably 99.0 mol% to 99.93 mol%. The degree of saponification can be determined in accordance with JIS K 6726-1994. By using the PVA-based resin with such a degree of saponification, it is possible to obtain a polarizer excellent in durability. If the saponification is too high, there is a risk of gelation.

PVA系樹脂的平均聚合度可以根據目的而適宜地選擇。平均聚合度通常為1000~10000，優選為1200~4500，進一步優選為1500~4300。再者，平均聚合度可以根據JIS K 6726-1994求出。The average degree of polymerization of the PVA-based resin can be appropriately selected according to the purpose. The average degree of polymerization is usually 1,000 to 10,000, preferably 1,200 to 4,500, and more preferably 1,500 to 4,300. In addition, the average degree of polymerization can be determined in accordance with JIS K 6726-1994.

作為二色性物質，例如可列舉出碘、有機染料等。這些可以單獨使用，也可以將2種以上組合使用。優選使用碘。這是由於，當非染色部為已進行了脫色的部分的情況下，通過與後述鹼性溶液的接觸，可以良好地形成非染色部。Examples of dichroic substances include iodine and organic dyes. These can be used individually or in combination of 2 or more types. Preferably, iodine is used. This is because when the non-dyeing portion is a portion that has been decolorized, the non-dyeing portion can be formed favorably by contact with the alkaline solution described later.

染色部12是指樹脂薄膜被二色性物質染色的部分。非染色部11可以是未用二色性物質染色的部分，也可以是用二色性物質染色後通過任意合適的方法進行了脫色的部分。非染色部優選為用二色性物質染色後進行了脫色的部分(脫色部)。通過染色後脫色，能够提高非染色部的强度。The dyed part 12 refers to a part where the resin film is dyed with a dichroic substance. The non-dyed part 11 may be a part that is not dyed with a dichroic substance, or may be a part that has been decolorized by any suitable method after being dyed with a dichroic substance. The non-dyed part is preferably a part (decolorized part) that is decolorized after being dyed with a dichroic substance. By decoloring after dyeing, the strength of the non-dyed part can be improved.

非染色部的寬度設定為任意合適的值。非染色部的寬度優選為1mm以上，更優選為10mm以上。如果非染色部的寬度為這種範圍，則可以適宜地防止偏光件的褪色。如上所述，通過設置非染色部，可以擴大影像顯示裝置的設計性的幅度。從設計性的角度來看，非染色部的上限不存在，可以設定為任意合適的寬度。The width of the non-dyed part is set to any appropriate value. The width of the non-dyed portion is preferably 1 mm or more, and more preferably 10 mm or more. If the width of the non-dyeing part is in this range, the fading of the polarizer can be suitably prevented. As described above, by providing the non-dyeing part, the design range of the video display device can be expanded. From a design point of view, the upper limit of the non-dyed portion does not exist, and it can be set to any appropriate width.

非染色部的透射率(例如在23℃下以波長550nm的光測得的透射率)優選為50%以上，更優選為60%以上，進一步優選為75%以上，特別優選為90%以上。如果為這種透射率，則能夠提供設計性優異的影像顯示裝置。進而，可防止妨礙攝像機、感測器等的功能，能夠更進一步發揮各種功能。The transmittance of the non-dyed part (for example, the transmittance measured at 23° C. with light having a wavelength of 550 nm) is preferably 50% or more, more preferably 60% or more, still more preferably 75% or more, and particularly preferably 90% or more. If it is such a transmittance, it is possible to provide an image display device excellent in designability. Furthermore, it is possible to prevent the functions of cameras, sensors, etc. from being hindered, and it is possible to further exert various functions.

偏光件(非染色部除外)優選在波長380nm~780nm的範圍顯示吸收二色性。偏光件(非染色部除外)的單體透射率(Ts)優選為39%以上，更優選為39.5%以上，進一步優選為40%以上，特別優選為40.5%以上。再者，單體透射率理論上的上限為50%，實用上的上限為46%。此外，單體透射率(Ts)是根據JIS Z8701的2度視野(C光源)測定並進行了可見度修正的Y值，例如可以使用顯微分光系統(Lambda Vision Inc.製造、LVmicro)進行測定。偏光件(非染色部除外)的偏光度優選為99.8%以上，更優選為99.9%以上，進一步優選為99.95%以上。The polarizer (except for the non-dyed part) preferably exhibits absorption dichroism in the wavelength range of 380 nm to 780 nm. The monomer transmittance (Ts) of the polarizer (excluding the non-dyed portion) is preferably 39% or more, more preferably 39.5% or more, still more preferably 40% or more, and particularly preferably 40.5% or more. In addition, the theoretical upper limit of the transmittance of the monomer is 50%, and the practical upper limit is 46%. In addition, the single transmittance (Ts) is a Y value measured in accordance with a 2 degree field of view (C light source) of JIS Z8701 and corrected for visibility. For example, it can be measured using a microscopic light system (manufactured by Lambda Vision Inc., LVmicro). The degree of polarization of the polarizer (excluding the non-dyeing portion) is preferably 99.8% or more, more preferably 99.9% or more, and still more preferably 99.95% or more.

偏光件的厚度可以設定為任意合適的值。厚度代表性的是為0.5μm以上且80μm以下，優選為30μm以下，更優選為25μm以下，進一步優選為18μm以下，特別優選為12μm以下，進一步特別優選小於8μm。厚度的下限值優選為1μm以上。厚度越薄，越能夠通過脫色良好地形成非染色部。例如接觸後述的鹼性溶液時，能夠以更短的時間形成非染色部。此外，有時接觸過鹼性溶液的部分的厚度會比其他部分薄。通過使厚度薄，能夠減小接觸過鹼性溶液的部分與其他部分的厚度差。The thickness of the polarizer can be set to any appropriate value. The thickness is typically 0.5 μm or more and 80 μm or less, preferably 30 μm or less, more preferably 25 μm or less, still more preferably 18 μm or less, particularly preferably 12 μm or less, and even more preferably less than 8 μm. The lower limit of the thickness is preferably 1 μm or more. The thinner the thickness, the better the non-dyed part can be formed by decoloring. For example, when contacting with the alkaline solution mentioned later, a non-dyeing part can be formed in a shorter time. In addition, sometimes the thickness of the part that has been in contact with the alkaline solution is thinner than other parts. By making the thickness thin, it is possible to reduce the difference in thickness between the part that has been in contact with the alkaline solution and other parts.

非染色部為脫色部的情況下，脫色部的二色性物質的含量優選為1.0重量%以下，更優選為0.5重量%以下，進一步優選為0.2重量%以下。如果脫色部的二色性物質的含量為這種範圍，則能夠充分賦予非染色部(脫色部)以所期望的透明性。另一方面，非染色部的二色性物質的含量的下限值通常為檢測限以下。再者，使用碘作為二色性物質的情況下，碘含量例如根據以螢光X射線分析測得的X射線強度，利用預先使用標準試樣繪製的標準曲線求出。When the non-dyed part is a decolorized part, the content of the dichroic substance in the decolorized part is preferably 1.0% by weight or less, more preferably 0.5% by weight or less, and even more preferably 0.2% by weight or less. If the content of the dichroic substance in the bleached part is in this range, it is possible to sufficiently impart the desired transparency to the non-dyed part (the bleached part). On the other hand, the lower limit of the content of the dichroic substance in the non-dyeing part is usually below the detection limit. In addition, when iodine is used as the dichroic substance, the iodine content can be obtained from, for example, the X-ray intensity measured by fluorescent X-ray analysis using a calibration curve drawn in advance using a standard sample.

B.偏光件的製造方法 本發明的偏光件可以通過任意合適的方法來製造。例如可以通過對樹脂薄膜實施溶脹處理、拉伸處理、利用碘等二色性物質的染色處理、交聯處理、洗滌處理、乾燥處理等各種處理來製造。若是通過不實施染色處理來形成非染色部的情況，可在使用任意合適的保護材料保護構成非染色部的部分的狀態下進行染色處理等各種處理，藉此形成非染色部。此外，若是非染色部為脫色部的情況，可對實施過染色處理的偏光件的沿著外緣的整個周圍實施脫色處理，藉此形成非染色部。代表性的是，通過對切斷成單體的偏光件實施脫色處理，能夠形成非染色部。再者，實施各種處理時，樹脂薄膜可以是形成在基材上的樹脂層。基材與樹脂層的層疊體可以通過例如將包含樹脂薄膜形成材料的塗布液塗布於基材的方法、將樹脂薄膜層疊於基材的方法等來得到。B. Manufacturing method of polarizing parts The polarizer of the present invention can be manufactured by any suitable method. For example, the resin film can be manufactured by performing various treatments such as swelling treatment, stretching treatment, dyeing treatment with dichroic substances such as iodine, crosslinking treatment, washing treatment, and drying treatment. In the case of forming the non-dyed part by not performing the dyeing process, various treatments such as dyeing treatment can be performed in a state where any suitable protective material is used to protect the part constituting the non-dyed part, thereby forming the non-dyed part. In addition, if the non-dyed portion is a decolorized portion, the entire circumference along the outer edge of the polarizer that has been dyed may be decolored to form the non-dyed portion. Typically, the non-dyed part can be formed by subjecting the polarizer cut into a single piece to a decolorizing treatment. Furthermore, when various treatments are performed, the resin film may be a resin layer formed on the substrate. The laminate of the substrate and the resin layer can be obtained by, for example, a method of applying a coating liquid containing a resin film forming material to the substrate, a method of laminating a resin film on the substrate, or the like.

染色處理代表性的是通過吸附二色性物質來進行。作為該吸附方法，例如可列舉出：將樹脂薄膜浸漬於包含二色性物質的染色液的方法、將該染色液塗覆於樹脂薄膜的方法、將該染色液噴霧於樹脂薄膜的方法等。優選為將樹脂薄膜浸漬於染色液的方法。這是由於，可以良好地吸附二色性物質。The dyeing treatment is typically performed by adsorbing dichroic substances. Examples of the adsorption method include a method of immersing a resin film in a dyeing solution containing a dichroic substance, a method of applying the dyeing solution to the resin film, and a method of spraying the dyeing solution on the resin film. Preferably, it is a method of immersing a resin film in a dyeing liquid. This is because the dichroic substance can be adsorbed well.

作為二色性物質，例如可列舉出碘、有機染料等。這些可以單獨使用，也可以將2種以上組合使用。優選使用碘。這是由於，通過與後述的鹼性溶液的接觸，可以良好地形成非染色部。Examples of dichroic substances include iodine and organic dyes. These can be used individually or in combination of 2 or more types. Preferably, iodine is used. This is because the non-dyeing part can be formed satisfactorily by contact with the alkaline solution described later.

若是通過不實施染色處理來形成非染色部的情況，優選由任意合適的保護材料保護樹脂薄膜的沿著外緣的整個周圍(相當於非染色部的部分)，進行染色處理。具體而言，作為樹脂薄膜的保護材料，例如可列舉出保護薄膜、表面保護薄膜。保護薄膜是可以直接用作偏光件的保護薄膜的膜。表面保護薄膜是在偏光件製造時暫時使用的。表面保護薄膜由於會在任意合適的時刻從樹脂薄膜去除，因此代表性的是借助黏著劑層黏貼於樹脂薄膜。作為保護材料的另一具體例子，可舉出光阻劑等。In the case of forming the non-dyeing part by not performing the dyeing process, it is preferable to perform the dyeing process by protecting the entire periphery (corresponding to the non-dyeing part) of the resin film along the outer edge with any suitable protective material. Specifically, as a protective material of a resin film, a protective film and a surface protective film are mentioned, for example. The protective film is a film that can be used directly as a protective film for a polarizer. The surface protection film is temporarily used when the polarizer is manufactured. Since the surface protection film is removed from the resin film at any appropriate time, it is typically stuck to the resin film via an adhesive layer. As another specific example of a protective material, a photoresist etc. can be mentioned.

使用碘作為二色性物質的情況下，作為染色液，優選使用碘水溶液。相對於水100重量份，碘的配混量優選為0.04重量份~5.0重量份。為了提高碘對水的溶解度，優選在碘水溶液中配混碘化物。作為碘化物，優選使用碘化鉀。相對於水100重量份，碘化物的配混量優選為0.3重量份~15重量份。When using iodine as a dichroic substance, it is preferable to use an iodine aqueous solution as a dyeing liquid. It is preferable that the compounding quantity of iodine is 0.04 weight part-5.0 weight part with respect to 100 weight part of water. In order to increase the solubility of iodine in water, it is preferable to mix iodide in an aqueous iodine solution. As the iodide, potassium iodide is preferably used. It is preferable that the compounding quantity of an iodide is 0.3 weight part-15 weight part with respect to 100 weight part of water.

在上述拉伸處理中，樹脂薄膜代表性的是進行單軸拉伸至3倍~7倍。再者，拉伸方向可以對應於所得偏光件的吸收軸方向。In the above-mentioned stretching treatment, the resin film is typically uniaxially stretched to 3 to 7 times. Furthermore, the stretching direction may correspond to the direction of the absorption axis of the resulting polarizer.

非染色部為脫色部的情況下，偏光件的脫色可以以任意合適的方法進行。例如可列舉出：利用雷射所行之脫色、或與包含鹼性化合物的鹼性溶液的接觸等。優選為與鹼性溶液的接觸。通過利用與鹼性溶液的接觸來形成非染色部，能夠長期維持非染色部的透明性。進而，能夠提高非染色部的強度。此外，能夠提高非染色部的阻隔性，防止偏光件的褪色。When the non-dyeing part is a bleaching part, the bleaching of a polarizer can be performed by arbitrary appropriate methods. For example, decolorization by laser, contact with alkaline solution containing alkaline compound, etc. are mentioned. Preferably, it is contact with an alkaline solution. By forming the non-dyeing part by contact with an alkaline solution, the transparency of the non-dyeing part can be maintained for a long period of time. Furthermore, the strength of the non-dyed part can be improved. In addition, the barrier properties of the non-dyed part can be improved, and the fading of the polarizer can be prevented.

作為鹼性溶液的接觸方法，可以採用任意合適的方法。例如可列舉出：對樹脂薄膜滴加、塗覆、噴霧鹼性溶液的方法，將樹脂薄膜浸漬於鹼性溶液的方法。As the contact method of the alkaline solution, any suitable method can be adopted. For example, a method of dropping, coating, and spraying an alkaline solution on a resin film, and a method of immersing the resin film in an alkaline solution can be cited.

在接觸鹼性溶液時，可以用任意合適的保護材料保護偏光件，以使鹼性溶液不接觸所期望部位以外的部分(不被脫色)。作為保護材料，可以使用上述用於保護非染色部分的保護材料。When contacting the alkaline solution, any suitable protective material may be used to protect the polarizing member so that the alkaline solution does not contact parts other than the desired part (not decolorized). As the protective material, the above-mentioned protective material for protecting the non-dyed portion can be used.

作為上述鹼性化合物，可以使用任意合適的鹼性化合物。作為鹼性化合物，例如可列舉出：氫氧化鈉、氫氧化鉀、氫氧化鋰等鹼金屬的氫氧化物，氫氧化鈣等鹼土金屬的氫氧化物，碳酸鈉等無機鹼金屬鹽，醋酸鈉等有機鹼金屬鹽，氨水等。在這些當中，優選使用鹼金屬及/或鹼土金屬的氫氧化物，進一步優選使用氫氧化鈉、氫氧化鉀、氫氧化鋰。能夠高效地使二色性物質離子化，能夠更簡便地形成非染色部。這些鹼性化合物可以單獨使用，也可以將2種以上組合使用。As the above-mentioned basic compound, any suitable basic compound can be used. Examples of basic compounds include: hydroxides of alkali metals such as sodium hydroxide, potassium hydroxide, and lithium hydroxide, hydroxides of alkaline earth metals such as calcium hydroxide, inorganic alkali metal salts such as sodium carbonate, and sodium acetate And other organic alkali metal salts, ammonia water and so on. Among these, hydroxides of alkali metals and/or alkaline earth metals are preferably used, and sodium hydroxide, potassium hydroxide, and lithium hydroxide are more preferably used. The dichroic substance can be ionized efficiently, and the non-dyeing part can be formed more simply. These basic compounds may be used alone or in combination of two or more kinds.

作為鹼性溶液的溶劑，可以使用任意合適的溶劑。具體而言，可列舉出：水，乙醇、甲醇等醇，醚，苯，氯仿和它們的混合溶劑。這些當中，由於離子化的二色性物質能夠良好地向溶劑移動，因此，優選使用水、醇。As the solvent of the alkaline solution, any suitable solvent can be used. Specifically, water, alcohols such as ethanol and methanol, ether, benzene, chloroform, and mixed solvents thereof can be cited. Among these, since the ionized dichroic substance can move to the solvent well, it is preferable to use water and alcohol.

鹼性溶液的濃度例如為0.01N~5N，優選為0.05N~3N，更優選為0.1N~ 2.5N。如果濃度為這種範圍，則可以良好地形成所期望的非染色部。The concentration of the alkaline solution is, for example, 0.01N to 5N, preferably 0.05N to 3N, and more preferably 0.1N to 2.5N. If the concentration is in this range, the desired non-dyed part can be formed satisfactorily.

鹼性溶液的液溫例如為20℃~50℃。樹脂薄膜與鹼性溶液的接觸時間可以根據樹脂薄膜的厚度、鹼性化合物的種類和鹼性溶液的濃度來設定，例如為5秒~30分鐘。The liquid temperature of the alkaline solution is, for example, 20°C to 50°C. The contact time between the resin film and the alkaline solution can be set according to the thickness of the resin film, the type of alkaline compound, and the concentration of the alkaline solution, and is, for example, 5 seconds to 30 minutes.

通過使樹脂薄膜與鹼性溶液接觸，鹼金屬及/或鹼土金屬的氫氧化物會殘留在接觸部。此外，通過使樹脂薄膜與鹼性溶液接觸，會在接觸部生成鹼金屬及/或鹼土金屬的金屬鹽。它們會生成氫氧化物離子，所生成的氫氧化物離子作用(分解/還原)於存在於接觸部周圍的二色性物質(例如碘絡合物)，而會擴大非染色區域。因此，優選與上述鹼性溶液接觸後，在與鹼性溶液接觸的接觸部，減少樹脂薄膜中所含鹼金屬及/或鹼土金屬。通過減少鹼金屬及/或鹼土金屬，能夠得到尺寸穩定性優異的非染色部。By bringing the resin film into contact with an alkaline solution, hydroxides of alkali metals and/or alkaline earth metals remain in the contact portion. In addition, by contacting the resin film with an alkaline solution, a metal salt of an alkali metal and/or alkaline earth metal is generated in the contact portion. They generate hydroxide ions, and the generated hydroxide ions act (decompose/reduce) on dichroic substances (such as iodine complexes) existing around the contact portion, and expand the non-dyeing area. Therefore, it is preferable to reduce the alkali metal and/or alkaline earth metal contained in the resin film at the contact portion of the alkaline solution after contact with the alkaline solution. By reducing alkali metals and/or alkaline earth metals, it is possible to obtain a non-dyeing portion excellent in dimensional stability.

作為上述減少方法，優選採用使處理液接觸與鹼性溶液的接觸部的方法。根據這種方法，能夠使鹼金屬及/或鹼土金屬從樹脂薄膜移動至處理液，減少其含量。As the aforementioned reduction method, it is preferable to employ a method of bringing the treatment liquid into contact with the contact portion of the alkaline solution. According to this method, the alkali metal and/or alkaline earth metal can be moved from the resin film to the treatment liquid, and the content thereof can be reduced.

作為處理液的接觸方法，可以採用任意合適的方法。例如可列舉出：對與鹼性溶液的接觸部滴加、塗覆、噴霧處理液的方法，將與鹼性溶液的接觸部浸漬於處理液的方法。As the contact method of the treatment liquid, any appropriate method can be adopted. For example, the method of dripping, coating, and spraying a processing liquid to the contact part with an alkaline solution, and the method of immersing the contact part with an alkaline solution in a processing liquid is mentioned.

在接觸鹼性溶液時，若是用任意合適的保護材料保護樹脂薄膜的情況，則優選以該狀態直接接觸處理液(特別是處理液的溫度為50℃以上時)。根據這種方式，能夠防止在與鹼性溶液的接觸部以外的部位由處理液導致的偏光特性降低。When contacting the alkaline solution, if the resin film is protected with any suitable protective material, it is preferable to directly contact the treatment liquid in this state (especially when the temperature of the treatment liquid is 50°C or higher). According to this aspect, it is possible to prevent the degradation of the polarization characteristics caused by the treatment liquid in the parts other than the contact part with the alkaline solution.

上述處理液可以包含任意合適的溶劑。作為溶劑，例如可列舉出：水，乙醇、甲醇等醇，醚，苯，氯仿和它們的混合溶劑。這些當中，從高效地使鹼金屬及/或鹼土金屬移動的角度來看，優選使用水、醇。作為水，可以使用任意合適的水。例如可列舉出：自來水、純水、去離子水等。The above-mentioned treatment liquid may contain any suitable solvent. Examples of solvents include water, alcohols such as ethanol and methanol, ethers, benzene, chloroform, and mixed solvents thereof. Among these, from the viewpoint of efficiently moving alkali metals and/or alkaline earth metals, water and alcohol are preferably used. As the water, any suitable water can be used. For example, tap water, pure water, deionized water, etc. can be mentioned.

接觸時的處理液的溫度例如為20℃以上，優選為50℃以上，更優選為60℃以上，進一步優選為70℃以上。如果為這種溫度，則能夠高效地使鹼金屬及/或鹼土金屬移動至處理液。具體而言，能夠顯著提高樹脂薄膜的溶脹率，物理性去除樹脂薄膜內的鹼金屬及/或鹼土金屬。另一方面，水的溫度實質上為95℃以下。The temperature of the treatment liquid during the contact is, for example, 20°C or higher, preferably 50°C or higher, more preferably 60°C or higher, and even more preferably 70°C or higher. If it is such a temperature, alkali metals and/or alkaline earth metals can be efficiently moved to the treatment liquid. Specifically, the swelling rate of the resin film can be significantly increased, and the alkali metal and/or alkaline earth metal in the resin film can be physically removed. On the other hand, the temperature of water is substantially 95°C or less.

接觸時間可以根據接觸方法、處理液(水)的溫度、樹脂薄膜的厚度等來適當調節。例如浸漬於溫水的情況下，接觸時間優選為10秒~30分鐘，更優選為30秒~15分鐘，進一步優選為60秒~10分鐘。The contact time can be appropriately adjusted according to the contact method, the temperature of the treatment liquid (water), the thickness of the resin film, and the like. For example, when immersed in warm water, the contact time is preferably 10 seconds to 30 minutes, more preferably 30 seconds to 15 minutes, and still more preferably 60 seconds to 10 minutes.

在一個實施方式中，作為上述處理液，可使用酸性溶液。通過使用酸性溶液，能夠將殘留於樹脂薄膜的鹼金屬及/或鹼土金屬的氫氧化物中和，化學性去除樹脂薄膜內的鹼金屬及/或鹼土金屬。In one embodiment, as the above-mentioned treatment liquid, an acidic solution can be used. By using an acidic solution, the alkali metal and/or alkaline earth metal hydroxide remaining in the resin film can be neutralized, and the alkali metal and/or alkaline earth metal in the resin film can be chemically removed.

作為酸性溶液中所含酸性化合物，可以使用任意合適的酸性化合物。作為酸性化合物，例如可列舉出：鹽酸、硫酸、硝酸、氫氟酸、硼酸等無機酸，甲酸、草酸、檸檬酸、醋酸、苯甲酸等有機酸等。酸性溶液中所含酸性化合物優選為無機酸，進一步優選為鹽酸、硫酸、硝酸。這些酸性化合物可以單獨使用，也可以將2種以上組合使用。As the acidic compound contained in the acidic solution, any suitable acidic compound can be used. Examples of acidic compounds include inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid, and boric acid, and organic acids such as formic acid, oxalic acid, citric acid, acetic acid, and benzoic acid. The acidic compound contained in the acidic solution is preferably an inorganic acid, and more preferably hydrochloric acid, sulfuric acid, and nitric acid. These acidic compounds may be used alone or in combination of two or more kinds.

優選的是，作為酸性化合物，可適宜地使用酸性度比硼酸強的酸性化合物。這是由於，其還可作用於鹼金屬及/或鹼土金屬的金屬鹽(硼酸鹽)。具體而言，能夠使硼酸從硼酸鹽游離出來，化學性去除樹脂薄膜內的鹼金屬及/或鹼土金屬。Preferably, as the acidic compound, an acidic compound having a stronger acidity than boric acid can be suitably used. This is because it can also act on metal salts (borates) of alkali metals and/or alkaline earth metals. Specifically, it is possible to free boric acid from borate and chemically remove alkali metals and/or alkaline earth metals in the resin film.

作為上述酸性度的指標，例如可舉出酸解離常數(pKa)，優選使用pKa比硼酸的pKa(9.2)小的酸性化合物。具體而言，pKa優選小於9.2，更優選為5以下。pKa可以使用任意合適的測定裝置進行測定，也可以參照化學便覽 基礎篇 改訂5版(日本化學會編、丸善出版)等文獻記載的值。此外，進行多級解離的酸性化合物中，在各階段pKa的值可發生變化。使用這種酸性化合物的情況下，可使用各階段的pKa的值中的任一個在上述範圍內的化合物。再者，在本說明書中，pKa是指在25℃的水溶液中的值。As an index of the acidity, for example, an acid dissociation constant (pKa) can be cited, and it is preferable to use an acidic compound having a pKa smaller than that of boric acid (9.2). Specifically, pKa is preferably less than 9.2, and more preferably 5 or less. The pKa can be measured using any suitable measuring device, and you can also refer to the value described in literature such as the Basics of Chemistry Handbook Revised 5th Edition (Edited by the Chemical Society of Japan, Maruzen Publishing). In addition, in acidic compounds undergoing multi-stage dissociation, the value of pKa may change at each stage. In the case of using such an acidic compound, any one of the pKa values at each stage can be used within the above-mentioned range. In addition, in this specification, pKa means the value in 25 degreeC aqueous solution.

酸性化合物的pKa與硼酸的pKa的差例如為2.0以上，優選為2.5~15，更優選為2.5~13。如果為這種範圍，則能夠高效地使鹼金屬及/或鹼土金屬移動至處理液，結果能夠實現非染色部的所期望的鹼金屬及/或鹼土金屬含量。The difference between the pKa of the acidic compound and the pKa of the boric acid is, for example, 2.0 or more, preferably 2.5-15, and more preferably 2.5-13. If it is in this range, the alkali metal and/or alkaline earth metal can be efficiently moved to the treatment liquid, and as a result, the desired alkali metal and/or alkaline earth metal content in the non-dyeing part can be achieved.

作為能够滿足上述pKa的酸性化合物，例如可列舉出：鹽酸(pKa：-3.7)、硫酸(pK2 ：1.96)、硝酸(pKa：-1.8)、氫氟酸(pKa：3.17)、硼酸(pKa：9.2)等無機酸，甲酸(pKa：3.54)、草酸(pK1 ：1.04、pK2 ：3.82)、檸檬酸(pK1 ：3.09、pK2 ：4.75、pK3 ：6.41)、醋酸(pKa：4.8)、苯甲酸(pKa：4.0)等有機酸等。Examples of acidic compounds that can satisfy the above pKa include hydrochloric acid (pKa: -3.7), sulfuric acid (pK 2 :1.96), nitric acid (pKa: -1.8), hydrofluoric acid (pKa: 3.17), boric acid (pKa : 9.2) and other inorganic acids, formic acid (pKa: 3.54), oxalic acid (pK 1 : 1.04, pK 2 : 3.82), citric acid (pK 1 : 3.09, pK 2 : 4.75, pK 3 : 6.41), acetic acid (pKa: 4.8) Organic acids such as benzoic acid (pKa: 4.0), etc.

再者，酸性溶液(處理液)的溶劑如上所述，在使用酸性溶液作為處理液的本方式中，也會發生上述樹脂薄膜內的鹼金屬及/或鹼土金屬的物理性去除。Furthermore, the solvent of the acidic solution (treatment liquid) is as described above, and in this embodiment using the acidic solution as the treatment liquid, physical removal of alkali metals and/or alkaline earth metals in the resin film also occurs.

上述酸性溶液的濃度例如為0.01N~5N，優選為0.05N~3N，更優選為0.1N~2.5N。The concentration of the acidic solution is, for example, 0.01N to 5N, preferably 0.05N to 3N, and more preferably 0.1N to 2.5N.

上述酸性溶液的液溫例如為20℃~50℃。與酸性溶液的接觸時間可以根據樹脂薄膜的厚度、酸性化合物的種類和酸性溶液的濃度來設定，例如為5秒~30分鐘。The liquid temperature of the above-mentioned acidic solution is, for example, 20°C to 50°C. The contact time with the acidic solution can be set according to the thickness of the resin film, the type of acidic compound, and the concentration of the acidic solution, and is, for example, 5 seconds to 30 minutes.

本發明的偏光件可以通過對包含二色性物質的樹脂薄膜實施這些處理來得到。再者，樹脂薄膜除了上述處理以外，還可以進一步實施任意合適的其他處理。作為其他處理，可列舉出鹼性溶液及/或酸性溶液的去除、以及洗滌等。The polarizer of the present invention can be obtained by performing these treatments on a resin film containing a dichroic substance. In addition, the resin film may be further subjected to any appropriate other treatments in addition to the above-mentioned treatments. Examples of other treatments include removal of alkaline solutions and/or acidic solutions, washing, and the like.

作為鹼性溶液及/或酸性溶液的去除方法的具體例子，可列舉出：利用廢棉紗頭等的擦拭去除、抽吸去除、自然乾燥、加熱乾燥、鼓風乾燥、減壓乾燥等。上述乾燥溫度例如為20℃~100℃。Specific examples of the method of removing the alkaline solution and/or the acidic solution include wiping removal using waste cotton yarn ends, suction removal, natural drying, heat drying, blast drying, reduced pressure drying, and the like. The drying temperature is, for example, 20°C to 100°C.

洗滌處理可通過任意合適的方法來進行。對於洗滌處理中使用的溶液，例如可列舉出：純水，甲醇、乙醇等醇，酸性水溶液和它們的混合溶劑等。洗滌處理可以在任意合適的階段進行。洗滌處理可以進行多次。The washing treatment can be performed by any suitable method. Examples of the solution used in the washing treatment include pure water, alcohols such as methanol and ethanol, acidic aqueous solutions, and mixed solvents thereof. The washing treatment can be carried out at any suitable stage. The washing treatment can be performed multiple times.

C.偏光板 本發明的偏光板具有上述偏光件。本發明的偏光板代表性的是，在其至少單側層疊保護薄膜來使用。作為保護薄膜的形成材料，例如可列舉出：二醋酸纖維素、三醋酸纖維素等纖維素系樹脂，(甲基)丙烯酸系樹脂、環烯烴系樹脂、聚丙烯等烯烴系樹脂，聚對苯二甲酸乙二醇酯系樹脂等酯系樹脂，聚醯胺系樹脂，聚碳酸酯系樹脂，它們的共聚物樹脂等。C. Polarizing plate The polarizing plate of the present invention has the above-mentioned polarizing member. The polarizing plate of the present invention is typically used by laminating a protective film on at least one side thereof. Examples of materials for forming the protective film include cellulose resins such as cellulose diacetate and cellulose triacetate, (meth)acrylic resins, cycloolefin resins, olefin resins such as polypropylene, and poly-p-phenylene. Ester resins such as ethylene dicarboxylate resins, polyamide resins, polycarbonate resins, and copolymer resins thereof.

對於保護薄膜未層疊偏光件的表面，作為表面處理層，可以形成硬塗層、防反射處理層、以擴散或防眩光為目的之處理層。For the surface of the protective film on which the polarizer is not laminated, as the surface treatment layer, a hard coat layer, an anti-reflection treatment layer, or a treatment layer for the purpose of diffusion or anti-glare can be formed.

保護薄膜的厚度優選為10μm~100μm。保護薄膜代表性的是，借助接著層(具體為接著劑層、黏著劑層)層疊於偏光件。接著劑層代表性的是由PVA系接著劑、活性能量射線固化型接著劑形成。黏著劑層代表性的是由丙烯酸系黏著劑形成。The thickness of the protective film is preferably 10 μm to 100 μm. The protective film is typically laminated on the polarizer via an adhesive layer (specifically, an adhesive layer and an adhesive layer). The adhesive layer is typically formed of a PVA-based adhesive or an active energy ray-curable adhesive. The adhesive layer is typically formed of an acrylic adhesive.

D.影像顯示裝置 本發明的影像顯示裝置具備上述偏光板。作為影像顯示裝置，例如可列舉出液晶顯示裝置、有機EL裝置。具體而言，液晶顯示裝置具備液晶面板，該液晶面板包括液晶單元以及配置於該液晶單元單側或兩側的上述偏光件。有機EL裝置具備有機EL面板，該有機EL面板在觀看側配置有上述偏光件。D. Image display device The image display device of the present invention includes the above-mentioned polarizing plate. Examples of image display devices include liquid crystal display devices and organic EL devices. Specifically, the liquid crystal display device includes a liquid crystal panel including a liquid crystal cell and the above-mentioned polarizers arranged on one side or both sides of the liquid crystal cell. The organic EL device includes an organic EL panel in which the above-mentioned polarizer is arranged on the viewing side.

如上所述，本發明的偏光件在沿著偏光件外緣的整個周圍形成有非染色部。因此，影像顯示裝置的邊緣部的色彩不受限制。因此，能夠提供設計性更優異的影像顯示裝置。此外，能夠提供可防止妨礙攝像機和感測器等的功能、可以更進一步發揮各種功能的影像顯示裝置。 產業上可利用性As described above, the polarizer of the present invention has a non-dyed portion formed along the entire periphery of the outer edge of the polarizer. Therefore, the color of the edge of the image display device is not limited. Therefore, it is possible to provide an image display device with more excellent design. In addition, it is possible to provide an image display device that can prevent the functions of cameras and sensors from being hindered, and can further perform various functions. Industrial availability

本發明的偏光件適宜用於液晶顯示裝置、有機EL裝置等影像顯示裝置。The polarizer of the present invention is suitable for use in image display devices such as liquid crystal display devices and organic EL devices.

10‧‧‧偏光件 11‧‧‧非染色部 12‧‧‧染色部10‧‧‧Polarizer 11‧‧‧Non-dyeing department 12‧‧‧Dyeing Department

圖1是本發明一個實施方式的偏光件的示意俯視圖。Fig. 1 is a schematic plan view of a polarizer according to an embodiment of the present invention.

10‧‧‧偏光件 10‧‧‧Polarizer

11‧‧‧非染色部 11‧‧‧Non-dyeing department

12‧‧‧染色部 12‧‧‧Dyeing Department

Claims (4)

一種偏光件，具有染色部和非染色部，該非染色部形成在沿著該偏光件外緣的整個周圍；前述非染色部的寬度為1mm以上。 A polarizer has a dyed part and a non-dyed part, the non-dyed part is formed along the entire periphery of the outer edge of the polarizer; the width of the aforementioned non-dyed part is 1 mm or more. 如請求項1之偏光件，其中前述非染色部為脫色部。 The polarizer of claim 1, wherein the non-dyed part is a decolorized part. 一種偏光板，具備如請求項1或2之偏光件。 A polarizing plate provided with the polarizing element as claimed in claim 1 or 2. 一種影像顯示裝置，具備如請求項3之偏光板。 An image display device provided with the polarizing plate as claimed in claim 3.
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