Itsuo Tanuma

A Flexible electronic-paper display with an ultra-thin and flexible LSI driver using quick-response liquid-powder technology

— A thin and flexible LSI driver with a thickness of less than 35 μm for a passive-matrix-driven Quick-Response Liquid-Powder Display (QR-LPD™) was successfully mounted onto the flexible printed circuit (FPC) and the back substrates of a flexible QR-LPD™. Amounted LSI driver on a plastic substrate shows no significant degradation in the driving performances and maintains physical flexibility without any connection failures. This technology can realize a fully flexible electronic paper in combination with a plastic-substrate QR-LPD™ fabricated by a roll-to-roll process.

45.1: Invited Paper: Ultra‐thin and Flexible LSI Driver Mounted Electronic Paper Display using Quick‐Response Liquid‐Powder Technology

The thin and flexible LSI driver with a thickness of less than 40μm for passive-matrix driven Quick-Response Liquid Powder Display (QR-LPD™) was successfully mounted onto the flexible printed circuit (FPC). The mounted LSI on the plastic substrate shows no significant degradation in the driving performances and keeps physical flexibility without any failures of connection. This technology can realize the fully flexible electronic paper in combination with a plastic substrate QR-LPD™ fabricated by roll-to-roll process.

Passive-Matrix Flexible Electronic Paper Using Quick-Response Liquid Powder Display (QR-LPD) Technollogy and Custom Driver Circuits

A low-power high-voltage physically-flexible driver is fabricated for passive-matrix plastic-substrate quick-response liquid powder displays (QR-LPD). A level-shifter circuit effectively reduces the power consumption and the chip area. The 2.3 times 21.4mm2 IC is thinned down to 35mum to obtain physical flexibility.

Development of Novel Bistable Display Using Titania Composite

In the past few years, there have been many different types of displays proposed for use in a paper-like display. This latest remarkable progress makes us feel the realization of electronic paper in the near future. However, it can be said that there remain several outstanding technical issues to be resolved before practical applications can be realized. Recently, we have demonstrated that the Quick-Response Liquid Powder Display (QR-LPD) by using titania composite is an attractive technology for use in multi-stable and reflective displays [1,2,3]. With this QR-LPD technology, we are presently developing a novel type of flexible, reflective and multi-stable display. In this paper we will show the latest QR-LPD technology.

P-165: Novel type of Flexible and Full Color Electronic Paper Displays Using Quick-Response Liquid Powder Technology

Using electronic liquid powder™ technology, the paper displays with both functions of flexibility and full color have been developed employing two structures. One has a conventional structure with color filters made with photolithographic process and the other has a “top color filter” structure with color filter prepared by flexography printing method. These displays have almost the same image quality with a thin thickness and a good flexibility.

Plasma surface treatment of fluoropolymers at atmospheric pressure

The plasma surface treatment at atmospheric pressure was applied to fluoropolymers and extensive interfacial contact was obtained by using helium gas. Surface analysis suggested that the fluorine was selectively etched and functional groups containing oxygen and nitrogen were produced. These changes increased surface energy. The transmission electron microscopic observation confirmed that microscale roughness of the surface was enhanced. The treated ethylene-tetrafluorinated ethylene films were bonded to a thermostable acrylonitrile-butadiene rubber compound with several adhesives by heat pressing. The urethane adhesive was found to be the best for heat aging.

Modification of polymer in the liquid crystal/polymer complex film

Several kinds of polymers for liquid crystal/polymer complex film (LC/P film) and their modifications had been examined in order to improve their thermal stabilities and mechanical durabilities. Crosslinked rubbery resin; modified poly butadiene, was found to be one of the suitable materials as matrix polymer. The matrix of polymethyl methacrylate, with which satisfactory optical property was available, showed poor thermal stability. The addition of multi-functional monomers which introduced crosslinking structure to the polymer was slightly effective to improve the thermal stabilities, while the matrix of modified polyamide shown inferior optical properties in spite of its desirable stabilities.