With the aim to fabricate flexible, mobile, and low-energy powered electronics, laser treatment of paper-based materials from carbon, cellulose, and natural products may be viable as one of the strategies to achieve this objective as it potentially provides a sustainable and precise patterning of a graphene-based circuit for various emerging electronic applications, such as sensor, robot, energy, and memory devices. Irradiation of high-energy beam for induction of porous-rich graphene or reduction of graphene oxide is easily accomplished from a commercially available laser machine with various laser sources, power, and pulse number setting. Moreover, the process itself can easily be adapted in the various manufacturing sectors due to the technology’s maturity status and its ability to be computer programmed. In comparison to environmental-benign polymer, the selection of paper as a substrate for electronics may introduce a new idea into the design possibility of electronic devices since the paper is not only thin, lightweight, biodegradable, and mechanically stable, but is also able to be assembled into another form and shape simply by traditional origami and kirigami technique for many applications. Here, in this work, recent laser processing strategies for the preparation of graphene either from graphitization of cellulose or deoxygenation of graphene oxide for green electronics are reviewed with brief coverage of the deposition technique of graphene oxide paper prior to laser annealing and discussion on the emerging relevant electronics field that benefitted greatly from the laser-assisted fabrication. To conclude the literature study, a remaining challenge, and prospective outlooks of laser writing of graphene on paper are also highlighted.

Toner Display is based on an electrical movement of charged particles. Two types of black and white toners charged in the different electric polarity are enclosed in the air space between two electrodes. The particle movement is controlled by the external electric field applied between two transparent electrodes. The black toner is collected to the electrode by an electrostatic force across the insulating layer to display a black image. The white toners can be put back to the counter electrode by applying a reverse electric field, and white solid image is displayed. We have studied on the movement of three color particles independently to display color image in Color Toner Display. Two positively charged color particles with different amount of charge to mass ratio and negatively charged white particles were enclosed in the toner display cell. Yellow, cyan and white images were displayed by an application of voltage.

전자종이는 패널 내부에서 외부광원에 의존하여 이미지를 나타내는 반사형 디스플레이다. 본 연구는 전자종이의 이해를 돕기 위하여 전자종이들의 구동특성 및 원리에 대하여 간략히 소개하였으며, 전자종이의 가장 기본적인 조건인 외부광원에 의해 선명한 이미지를 볼 수 있는지를 나타내는 반사율, 대조비, 시야각 등의 광학적인 특성과 플렉서블 패널적용 가능여부 등을 바탕으로 제시된 전자종이들의 기술적 접근상태에 따른 시장성에 대하여 분석하였다.