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  6. Resistive Touch Panel Product Background

Resistive Touch Panel Product Background

Fujitsu Components America, Inc. began actively marketing analog resistive-film touch panels for transmissive, transflective and reflective LCDs in North America in November, 2001. The touch screens are manufactured at facilities in Japan and Taiwan.

Using its expertise in materials development and advanced technology, Fujitsu’s resistive touch panels offer the following competitive features:

Fujitsu Touch Panel Applications
  • low power consumption
  • cost effective
  • durability
  • high optical performance
  • narrow borders
  • stylus and finger usage
  • multi-touch
  • flush surface

Primary applications include desktop, notebook and palmtop PCs; intelligent kiosks; handheld and portable instrumentation; automotive instrumentation, navigation and entertainment systems; voting machines; office equipment; process control; medical and financial equipment; consumer electronics; and Point-of-Sale terminals.

Fujitsu supplies 4-, 5- and 7-wire, resistive touch panels in 1.8 to 17.3-inch (diagonal) sizes using Film-Glass, Film-Film, and Film-Film-Plastic construction. Many Fujitsu touch panels are available off-the-shelf and are designed to fit standard-size LCDs to simplify and reduce product development time for OEMs. Semi-custom and custom designs are also available.

For high-use or abusive environments, Fujitsu developed replaceable, Self-Wetting Adhesive Protector Sheets that minimize surface wear, increase panel life and reduce maintenance costs.

In 2009, Fujitsu was the first manufacturer to release analog resistive, Multi-Touch panels certified for Windows 7® logo products. This expanded offering positions Fujitsu at the forefront of resistive touch panel product development.

Fujitsu Touch Panel Technology

Fujitsu’s touch panels use 4-wire and proprietary, patented 5-wire and 7-wire analog resistive-film technology. The company developed 7-wire technology as a competitive solution to the industry’s 5-wire concept. It utilizes diode current switching of voltages applied to the glass to enable better switching and improved linearity. These techniques are conducive to high-reliability applications and handwriting detection capability not possible with capacitive touch technology. Using only the top film as a voltage probe also provides the same reliability relative to physical operation as 5-wire types.

An added advantage of a 7-wire panel is the use of four sense lines that monitor the resistance of the glass, compensating for any variation caused by physical or environmental changes, such as temperature and aging. This assures that the highest possible accuracy is maintained over the life of the product. The standard specified writing life of a Fujitsu 7-wire panel is one million words, minimum.

Fujitsu’s 5-wire resistive touch panels feature a patented design construction and detection method that improves edge-area linearity to +/- 2 percent and allows narrow-frame borders with large-size and wide-aspect ratio displays (e.g. 9mm for 15-inch size). Target applications include POS systems and kiosks for the retail, restaurant and hospitality markets. Other 5-wire panel specifications include a minimum operating life of 35 million touches, 80% to 85% transmissivity, an operating environment of -20C to +60C degrees, and 20% to 90% relative humidity.

Competitive Features

Multi-Touch

Fujitsu’s multi-touch resistive touch panels accept single-tap and multiple-touch input to allow stylus handwriting and two-finger manipulation, including pinch, push, rotate and scroll functionality. These panels use a proprietary, patented Fujitsu construction, making them highly durable and capable of large-size panel designs. They are currently available in 5 to 12-inch sizes and are Windows® 7 logo approved. Complete support includes controller boards, ICs, and Drivers.

 

Optics

Fujitsu’s developments in low-reflection optical technologies are notable. These include industry-standard 78% to 86% transmissivity panels, as well as several proprietary optical enhancements. Its patented, anti-reflective coating and application process enabled the company to be the first to produce resistive touch panels with 92% transmissivity. Fujitsu also offers anti-smudge and scratch-resistant coatings for rugged applications. Its low-reflectivity designs and linear polarizers are particularly suitable for high-ambient light and outdoor applications.

 

Film-Film Plastic Panels

Fujitsu produces Film-Film-Plastic touch panels that are more durable than Film-Glass panels and have 2x the life of typical Film-Film panels. Ideal for mobile and industrial handheld terminals and computers, these shatterproof touch panels use a polycarbonate plastic plate, making them 30-40% lighter than Film-Glass panels. The addition of a 3H, hard-tap cover film increases the panel’s input load by up to 50% (0.1N to 1.5N) without damage from heavy writing pressure or repeated stylus tapping. Logos, icons, numbers or symbols can be directly screen printed on the plastic plate, and they can also be custom-shaped for a specific application.

Narrow Frames

Fujitsu’s 2.3mm minimum panel frame width is among the narrowest offered in the industry. This accomplishment, combined with Fujitsu’s advanced technology, increases the amount of usable touch-input space and provides more accurate tracking performance and longer life at the edges of the panel. Precisely controlled micro-dot height and spacing patterns, along with an air-tight panel construction, prevents moiré effect and Newton Rings.

Active R&D program

For future products, Fujitsu is focused on bringing resistive touch panels into new markets through the continued improvement of optical characteristics and further developments in panel design and materials to enhance environmental durability, reliability and operational life.