NEC LCD Technologies has developed multiple sizes (A3 and A4 equivalent) of electronic paper (e-paper) modules using the microcapsule electrophoresis system.
Developed by E Ink Corp (USA), the electrophoresis system contains white pigment particles electrified with positive electrodes, and black pigment particles electrified with negative electrodes. Each pigment particle is contained in a clear microcapsule that is moved by applying voltage, which thereby creates a visible display. The prototype uses E Ink's Vizplex Imaging Film.
The e-paper modules are said to boast higher visibility and gradation when compared to general newspapers, and leverage NEC LCD Technologies' experience and proprietary advancements with TFT active matrix to secure 16 step grayscale, white reflectivity of 43% and a contrast ratio of 10:1.
Additionally, e-paper modules can be used to form large screen displays by combining up to eight modules, which incorporate the company's original multi-tiling controller. The A3 e-paper module is composed of especially narrow frames, with two sides measuring just 1mm, which enables the creation of large screens that feature effective multi-tiling.
E-paper's display utilizes reflected light and paper to produce wide viewing angles, provide high visibility under direct sunlight and reduce strain on the eyes of viewers. Moreover, e-paper minimizes electricity needs by maintaining display information without using power, and requires only low power to perform screen rewriting. The slim profile and light weight of the e-paper modules makes them suitable for portable equipment.