Stock material or miscellaneous articles – Composite – Of quartz or glass
Patent
1998-02-06
2000-11-07
Zimmerman, John J.
Stock material or miscellaneous articles
Composite
Of quartz or glass
428469, 428922, B32B 1504, C09D 524, H01J 2928
Patent
active
061434183
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a transparent conductive film having high transparency, tonability, and conductivity, exceptional anti-static effects and electromagnetic shielding effects, and greatly improved durability such as with respect to saline resistance, acid resistance, oxidation resistance, and ultraviolet resistance; a low-reflectivity transparent conductive film having exceptional anti-reflective effects in addition to the above-mentioned properties; and an electromagnetically shielded display device having this low-reflectivity transparent conductive film formed on the display screen.
BACKGROUND ART
Conventionally, transparent materials having high dielectric constants such as glasses and plastics tend to accumulate static electricity and allow transmission of electromagnetic waves. In particular, in cathode ray tubes and plasma displays which are often used for TV Braun tubes and computer displays, dust can collect due to static electricity generated on the display screen so as to lower the visibility, and electromagnetic waves can be radiated to affect the environs. For this reason, transparent conductive films have been affixed to the display screens of cathode ray tubes and plasma displays used in TV Braun tubes and computer displays for the purposes of preventing static electricity and/or shielding electromagnetic waves.
Conventional transparent conductive films are produced by forming a transparent conductive oxide such as indium oxide on a display screen by means of sputtering or vapor deposition and affixing this to the display screen of a display device, or by coating the front surface of a display screen with a dispersion fluid of antimony-doped tin oxide and a silica sol binder. Additionally, there are transparent conductive films which are provided with a reflection preventing function by making use of interference effects which occur due to reflection at a plurality of thin film surfaces, by laminating the top layer and/or the bottom layer of the transparent conductive film with at least one transparent anti-reflective layer having a refractive index different from the transparent conductive layer.
As conventional methods for forming a transparent conductive film which not only prevents the accumulation of static electricity but also has conductivity high enough to shield electromagnetic radiation on the display screen of a display device, a process of putting the display screen into a vapor deposition oven and depositing indium oxide compounds or tin oxide compounds thereon (PVD process), and a process of forming a transparent conductive film on the display screen by thermal decomposition of organic compounds such as indium or tin, or saline solution (CVD process) are known.
While the transparent conductive films formed by the above-mentioned methods are sufficiently transparent when used only as anti-static films in which case the film thickness can be small, when used as electromagnet wave shielding layers or electrode films, they must be made somewhat thicker because they require high conductivity, as a result of which the transparency can be reduced, and the screen darkened, as well as giving rise to problems such as absorption of specific optical wavelengths which can cause coloring of the conductive film and cause unnatural changes in the hue of the transmitted images. Additionally, since a vacuum or high temperatures are required in order to form a film using the above-mentioned PVD process or CVD process, the cost of investments in order to form a transparent conductive film on a large-area substrate can become extremely high, the efficiency can be degraded, and the production costs can inflate.
Coating processes have been proposed for efficiently forming transparent conductive films on large substrates while suppressing equipment investments. For example, coating materials containing organic indium compounds is disclosed in Japanese Patent Application, First Publication No. Sho 52-1497, and coating materials having indium salts or tin salts dissolve
REFERENCES:
patent: 4565719 (1986-01-01), Phillips et al.
patent: 5493102 (1996-02-01), Takase et al.
patent: 5785897 (1998-07-01), Toufuku et al.
patent: 5911899 (1999-06-01), Yoshikai et al.
Adachi Kenji
Kunimitsu Yasunori
Mori Kazutomo
Noda Ichirou
Takamiya Naoki
Sumitomo Osaka Cement Co. Ltd.
Zimmerman John J.
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