Classifications

• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F7/00—Signs, name or number plates, letters, numerals, or symbols; Panels or boards
  • G09F7/002—Signs, name or number plates, letters, numerals, or symbols; Panels or boards weather-proof panels or boards
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/18—Manufacture of films or sheets
• • 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
• • 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
  • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
  • G02F1/133331—Cover glasses

Definitions

• the present invention relates to a protective cover material suitable for protecting a display portion surface of a flat panel display such as a liquid crystal display and a plasma display used for a computer, a television, and the like, and a method of protecting the display portion surface.
• a liquid crystal module used for a personal computer, a television, or the like is configured by laminating a polarizing film, a retardation film, a liquid crystal, a color filter, and a glass substrate.
• the display surface of the liquid crystal module is usually protected by a surface protective cover material to prevent dust, dirt and the like from adhering, scratching, and dirt during the liquid crystal module assembling and transporting steps.
• a surface protective cover material polyethylene, polypropylene, polyethylene terephthalate film and the like are used. Then, a removable adhesive layer is provided on the surface of the film in contact with the liquid crystal module display section surface, and a protective cover material is attached to the liquid crystal module display section surface, or a film having no adhesive layer is provided on the liquid crystal module display.
• a fixing method is used in which the film edge is fixed to a liquid crystal module by using an adhesive tape or the like while being superposed on the front surface side. Among the methods for protecting the display unit surface, the latter method is economically excellent and has been widely used in recent years.
• the non-adhesive protective cover material is fixed to the bezel of the liquid crystal module so that the protective cover material and the display surface of the liquid crystal module do not adhere to each other.
• contact is made especially near the center of the display due to dripping or curling of the protective cover material due to environmental conditions.
• this problem occurs even when the polymer film having excellent moisture permeability proposed in Patent Document 1 is used for the protective cover material, and thus the moisture permeability of the protective cover material (after being left in a high humidity atmosphere).
• the adjustment of moisture permeability cannot be dealt with.
• a similar problem may occur not only in the protective cover material on the surface of the display unit of the liquid crystal module but also in the protective force bar material on the surface of the display unit of a flat panel display such as a plasma display.
• Patent Document 1 Japanese Patent Application Laid-Open No. 2001-209039
• the inventor of the present application has found that the surface of the display unit of the liquid crystal module and the protective cover material are in close contact with each other, and water vapor accumulates in the adhered portion and becomes wet. Further investigations were made on the color change and the phenomenon that the display surface was significantly stained after the wet part was dried. As a result, it has been found that this problem occurs particularly when a non-adhesive type protective cover material is used on the display surface of a specific liquid crystal module. In other words, it has been found in recent years that this phenomenon has occurred particularly in a liquid crystal module having a display unit surface of a type having a high surface smoothness, which is excellent in external design.
• the surface roughness of the surface of the display portion of such a high smoothness type was not more than 0: m in 10-point average roughness.
• m in 10-point average roughness it has been found that such a problem hardly occurs in a conventionally used liquid crystal module of a type in which minute irregularities are provided in order to suppress reflection of light on the surface of the display section.
• the surface roughness of the display unit of such a type with minute irregularities is about 1. Ozm 3. Ozm in 10-point average roughness.
• the problem of force is a force that has rarely occurred in the past.
• the inventors of the present application have conducted intensive studies and as a result, have used a protective cover material having a specific surface roughness for a liquid crystal module having a highly smooth type display surface.
• a protective cover material having a specific surface roughness for a liquid crystal module having a highly smooth type display surface.
• the present invention has been found that the above-mentioned problems of optical color change occurring on the surface of the display portion and remarkable staining of the surface of the display portion do not occur.
• scratches generated during transportation are significantly reduced.
• the present invention was completed.
• the present invention provides a flat panel display having a surface having a 10-point average roughness in the range of 0.5 ⁇ m to 20 ⁇ m in terms of 10-point average roughness.
• the present invention also provides a method for protecting the display unit surface. ADVANTAGE OF THE INVENTION According to the present invention, it is possible to prevent an optical color change from occurring on the surface of the display unit and to prevent the surface of the display unit from being significantly contaminated, and it is possible to remarkably reduce scratches on the surface of the display unit during transportation and the like. .
• the display surface protective cover material of the liquid crystal module (hereinafter referred to as the protective cover material) has a surface roughness in contact with the display surface with a 10-point average roughness in the range of 0.5 / im—20 / im. It is a child film. That is, the protective cover material has irregularities of a certain size or more on the surface in contact with the display unit surface.
• the average roughness of 10 points is more preferably 1.0 ⁇ or more. Also, if the surface unevenness is too large, when checking the surface condition of the liquid crystal module through the protective cover, the liquid crystal module display surface and the protective cover are rubbed due to transportation or the like, and the unevenness of the protective cover surface is reduced. There is a risk of scraping off. Therefore, it is preferable that the surface irregularities have a 10-point average roughness of 10 ⁇ m or less, and those having a surface roughness of more than 20 ⁇ m are inappropriate.
• a method in which an inorganic filler or a rubber component is mixed into a polymer material so that the film itself has fine irregularities, or a rubber roll having a predetermined surface roughness when forming a polymer film There are a method of transferring the uneven shape by pressing a metal roll and a method of roughening the surface by corona treatment.
• the polymer film is desirably transparent to the extent that the state of the surface of the display section of the liquid crystal module (whether there is a scratch or dust) can be visually recognized with the protective cover material attached.
• the protective cover material for example, polyethylene film, polypropylene film, polystyrene film, polyethylene terephthalate film, polyvinyl alcohol film, polyvinyl chloride film, nylon film, cellulose film, polyacrylonitrile film, polymethacrylic acid And the like.
• the protective cover material has a role of protecting the surface of the liquid crystal module display unit from foreign substances such as dust and dust, and a film having an antistatic treatment is preferable.
• the antistatic treatment a method of kneading an antistatic agent into a polymer material, a method of laminating the kneaded layer on a polymer film surface by coextrusion molding or the like, a method of adding an antistatic agent to a polymer film.
• Known treatment methods can be used, such as laminating a film that has been subjected to surface coating and antistatic treatment to a polymer film.
• the type of the antistatic agent is not limited as long as it can be added to the polymer material.
• various surfactants such as cationic type, anion type and nonion type, antistatic paints using urethane, acryl, polyester and the like as binders, permanent antistatic agents obtained by alloying a hydrophilic polymer with an acrylic resin, etc., carbon
• a conductive filler using metal oxides such as black, graphite, zinc oxide and tin oxide.
• the permanent antistatic agent does not decrease the antistatic performance in a low-humidity environment and does not decrease the antistatic performance due to precipitation and wiping of the antistatic agent, as observed in various surfactants.
• carbon black, graphite or the like can be made transparent (visualization), which is difficult to realize, and is also preferable because it is more economical than metal oxides and the like.
• the protective cover material configured as described above can be used, for example, in an assembling process or a transport process of a liquid crystal module having a smooth display surface (the display surface has a 10-point average roughness of 0.1 ⁇ m or less). You In addition, it is preferably used to prevent adhesion of dust, dirt, and the like to the surface of the display unit, generation of scratches and dirt.
• the protective cover material is fixed to the liquid crystal module so as to cover the display unit surface using an adhesive tape.
• a copolymer composed of a styrene monomer and a (meth) acrylate monomer (trade name: Clearpact TI300: Dainippon Ink and Chemicals, Inc.) and polyether estenoleamide (trade name: Perestad NC7530) : Sanyo Kasei Co., Ltd.) and 30 parts by weight were pellet-mixed.
• the sheet was extruded from a sheet die along a metal casting roll, and one side was pressed with a 10 ⁇ m silicone rubber roll with an average roughness of 10 points to form a film having a thickness of 100 ⁇ m.
• Example 2 The same mixture as in Example 2 was extruded from a sheet die along a metal casting roll, and one surface was pressed with a 15 ⁇ m silicone rubber roll having an average roughness of 10 points to form a film having a thickness of 100 ⁇ m. .
• Example 2 The same mixture as in Example 2 was extruded from a sheet die along a metal casting roll, and one surface was pressed with a 20 ⁇ m silicone rubber roll having an average roughness of 10 points, and a thickness of 100 ⁇ m. It was formed into a film.
• a polypropylene raw material was extruded from a sheet die along a metal casting roll, and one side was pressed with a 20 ⁇ m silicone rubber roll having an average roughness of 10 points to form a 100 ⁇ m thick film.
• Antistatic biaxially stretched polyethylene terephthalate film (trade name: Lumirror X53: manufactured by Toray)
• a single copolymer (trade name: Clearpact TI300: Dainippon Ink & Chemicals, Inc.) consisting of a styrene monomer and a (meth) acrylate monomer is taken out from the sheet die along the metal caster. The film was formed into a film having a thickness of 100 ⁇ m.
• the films of Examples 15 and 15 and Comparative Examples 1 and 2 were superimposed on the surface of the liquid crystal module display section (10-point average roughness of 0.05 / im or less) subjected to hard coating, and the film and the liquid crystal module were superposed. And were taped at the ends. When the surface roughness of the film was different between the front and back, the rough surface was in contact with the LCD module display surface.
• the water vapor transmission rate f of each film was measured by ISZ0208.
• Haze Pio was measured by ISK7105.
• Example 1 to 5 no adhesion was observed. However, in Example 4 where the surface unevenness was large, the haze was large and crystallization occurred during cooling, and in Example 5 the film became opaque. In Examples 4 and 5, the liquid crystal module surface was exposed through the protective cover material. The surface of the indicator was confirmed and found to be difficult. Although the haze can be small, it is not necessary to use high transparency for the purpose of the protective cover material.If the surface of the display unit can be seen through the protective cover material, the preferred haze is about 20%. There is no problem at all. The force depending on the thickness of the protective cover material When the haze value exceeds 40%, the visibility deteriorates.
• Example 5 and Comparative Example 2 in which the antistatic treatment was not performed a phenomenon was observed in which the protective cover material absorbed dust in the atmosphere and the surface of the liquid crystal module display portion was stained.
• Example 1 As a result of the actual transport test, the defective rate after transport was 0.8% in Example 1 and 0.5% in Example 2, compared with 3.8% in Comparative Example 1. In Example 3, 0.6% and in Example 4, 0.8%, respectively, showed a remarkable effect of reducing the defect rate after transportation as compared to Comparative Example 1.
• This embodiment has the following advantages.
• the polymer film constituting the protective cover material has been subjected to an antistatic treatment. Therefore, it is possible to prevent the protective cover material from adsorbing dirt, and it is possible to easily visually recognize the presence or absence of scratches and dust on the display unit surface while the protective cover material covers the display unit surface.
• the polymer material of the main component constituting the polymer film and the polymer material functioning as a permanent antistatic agent are pellet-mixed and extruded from a sheet die along a metal casting roll, A polymer film was produced by forming a film. Therefore, after the polymer film is manufactured, it takes more time to perform the antistatic treatment as compared with an antistatic treatment such as surface coating of an antistatic agent and bonding of the film subjected to the antistatic treatment to the polymer film. Absent.
• Embodiments are not limited to those described above.
• the embodiment may be embodied as follows.
• a protective cover material may be added with a sliding material and a processing aid used in general plastic processing. Good.
• a stabilizer, a plasticizer, a colorant, and the like may be added as necessary.
• the present invention is not limited to a protective cover material for protecting the display unit surface of the liquid crystal module, and may be applied to a protective cover material for protecting the display unit surface of a flat panel display such as a plasma display panel.

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• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• General Physics & Mathematics (AREA)
• Manufacturing & Machinery (AREA)
• Nonlinear Science (AREA)
• Theoretical Computer Science (AREA)
• Materials Engineering (AREA)
• Optics & Photonics (AREA)
• Crystallography & Structural Chemistry (AREA)
• Mathematical Physics (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Devices For Indicating Variable Information By Combining Individual Elements (AREA)
• Packaging Frangible Articles (AREA)
• Laminated Bodies (AREA)
• Liquid Crystal (AREA)

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• 2004
  • 2004-07-29 CN CNB2004800015444A patent/CN100444216C/zh not_active Expired - Fee Related
  • 2004-07-29 JP JP2005512506A patent/JP3825794B2/ja not_active Expired - Fee Related
  • 2004-07-29 TW TW093122687A patent/TW200510475A/zh not_active IP Right Cessation
  • 2004-07-29 KR KR1020057010320A patent/KR100721162B1/ko not_active Expired - Fee Related
  • 2004-07-29 WO PCT/JP2004/010802 patent/WO2005013245A1/ja not_active Ceased

Patent Citations (4)

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