Technical Session


Touch Panel ITO-Alternative Film

Paving the Way for Larger Touch Panels:Ag-Based Approach Evolving; Cu-Based Designs Appear

Datetime: 10/24  14:30 - 17:00

Floor: PACIFICO YOKOHAMA Conference Center

About lecture and lecturer

Development of the Cu mesh type touch panel (SpiderNet)

As for the sensor film for capacitive touch panel, ITO on PET film is often used, but the commercially available film has about 100Ω/□. This is too much high resistance to make the large area touch panel. The candidate of ITO substitute material is An Ag nanowires coating film. But the silver is high cost and has the durability problem such as migration. We developed the Cu mesh film. We have produced a 10 points input touch panel which had 4~8μm line width mesh pattern. This Cu mesh film is superior in flexibility and can be proposed new uses, such as frameless touch panel.

Kenji Nakatani

Kenji Nakatani

Manager of Development Dep.

Touch Panel Labortories Co., Ltd.


1977   Completed a doctor’s course at Graduate School of Engineering Science of Osaka University.


1977-2008   Teijin Co.Ltd     Tokyo Japan

    I had developed the technology of Roll to Roll production of a-Si:H solar cell

    I had developed the Polymer Dispersion Liquid Crystal Display

    Chief researcher

    Manager of Record Medea Technology Development

2008-Present   Touch Panel Laboratories Co.,Ltd     Tokyo Japan

    Manager of Development Dep.

Evolving Touch Panels with Thin Copper Wires

Touch panel-equipped display devices are spreading from smartphones and tablets to PCs, electronic blackboards, and more. The speaker introduces the use of thin copper wires in touch panels as a new technology to replace ITO. Such touch panels offer resistances a power of ten lower than ITO, making it possible to form electrodes and taps in a single process for advantages including larger screens, narrower frames, faster response, higher capacity, and lower cost. Reduced visibility caused by the use of opaque metal wires has been overcome through the use of blackening and pattern design. The speaker also covers future stylistic improvements due to thinner wires and dual-surface implementation, as well as the potential for application in tablets and smaller sizes.

Noritoshi Tomikawa

Noritoshi Tomikawa

General Manager Development I New Business Department Material Solutions Division


Born in Ichikawa, Chiba, Japan, in 1961. MS in Physics from Tokyo University of Science, followed by employment at ULVAC, Inc. Entered Toppan Printing Co., Ltd. in 1989, engaged in R&D into OLED devices, gas barrier films, and anti-fouling layers for AR films at the Technical Research Institute. Later involved in the launch of the anti-reflective film business, in 2008 in the development of touch panel ITO films and related business launch, and in 2011 in the development of capacitive touch panels and related business launch. Currently works in New Business Promotion Department, Material Solutions Division at Toppan Printing.

ITO-Alternative Transparent, Conductive Films Promise Larger Screens, Lower Resistance

For 15-inch and larger applications, manufacturers are replacing ITO film with transparent, conductive films based on Ag or Cu compounds instead. The AgNW film has the highest resistance, at about 50Ω/sq, while metal designs using Ag or Cu meshes drop as low as several to 1Ω/sq: a level adequate for 23-inch PC monitors or other, even larger, applications. Some manufacturers are optimistic the new films will open up new applications for capacitive touch panels, including electronic blackboards and digital signage, and the industry is watching supply and demand trends closely.

Tomoko Funaki

CMEO Research Dept. Manager

Yano Research Institute Ltd.

Entered Yano Research Institute in 1997, appointed CMEO Division Manager in April 2012. Involved in surveys and research into primarily plastic material and processing technology markets throughout that period, including investigations into electronics, packaging, and packing fields from the viewpoint of materials. Actively contributes articles to newspapers and industry journals, and offers seminars.

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