Yuh-Zheng Lee

Flexible fullerene field-effect transistors fabricated through solution processing.

Recent research into organic semiconductors for organic thin-film transistors (OTFTs) – as alternatives to amorphous silicon-based systems – has yielded improved synthetic and fabrication techniques for devices with great potential for the use in consumable electronic applications.[1–3] To realize the advantages of organic semiconductors in practical applications, OTFTs fabricated through solution processing (spin-coating, casting, or printing) on flexible substrates are strongly desired. Although many groups have developed OTFTs incorporating soluble small-molecule or polymer semiconductors, the number of available hole-transporting materials overwhelms the number of electron-transporting materials.[4–6] Preparing efficient organic integrated circuits at low cost requires soluble hole- and electron-transporting materials that ideally exhibit comparable electrical performance. At present, the development of highperformance n-channel OTFTs remains a challenge, especially when using attractive fabrication processes (e.g., solution processing).

Ring-Edged Bank Array Made by Inkjet Printing for Color Filters

A mask-free inkjet printing (IJP) process has been developed to fabricate color filters. The coffee ring effect was used to create a ring-edged bank array with fine structures by IJP of poly(methylmethacrylate). After the color filtering inks were deposited in the banks, a color filter panel was made without any transitional photolithography process. The resulting color coordinates of the three primary colors on the chromaticity diagram are (0.70, 0.30), (0.33, 0.60) and (0.14, 0.09), respectively, covering 67.8% of the National Television System Committee standard. This process can be used with flexible substrates to produce low-cost inkjet printed color filters.

A single-substrate multicolor cholesteric liquid-crystal display prepared through ink-jet printing

— Ink-jet printing was used to prepare a single-substrate multicolor cholesteric liquid-crystal (Ch-LC) display incorporating three Ch-LCs exhibiting different reflective wavelengths. A room-temperature low-vacuum chemical-vapor-deposition process was developed for coating a thin polymer film onto the Ch-LC so that the top electrode could be coated onto the Ch-LC layer. Herein, the successful operation of such a 10.4-in. QVGA Ch-LC display at 40 V will be described.

20.1: SingleSubstrate Cholesteric Liquid Crystal Display by InkJet Printing Liquid PIPS Solution

This paper provides a photopolymerisation induced phase separation PIPS method for fabricating a bistable cholesteric liquid crystal display. We combine inkjet printing technology and phase separation method producing single substrate sidebyside color cholesteric liquid crystal displays by sequential inkjet printing for each color liquid crystals. The display exhibits an areacolourful image with low switching voltages and can be realized on a large scale and rolltoroll R2R fabrication in the future.

Study of an Industrial Multi-Agent Framework with an Application to Multirobots Fire-rescue Simulation

This paper presents the authors’ experience in implementing a multi-agent system created for communication and coordination purposes among mobile robots. The complete system described here is an industrial application focused and aimed at integrating robots, environment and user agents via an agent platform. The work bridges the gap between robots and a JAVA based agent platform. A scenario based multi-robot firerescue simulation is used as a study example. The scenario can be rewritten to suit different industrial requirements. The multiagent framework and its control hierarchy is discussed, path planning with object-avoidance issue is addressed. The actual simulation demonstrates feasibility of this type of agent based system integration. Future work would focus on integration of environment and user agents.