Multiple color states have been realized in single unit cell using double electrochromic (EC) reaction. The precise control of bistability in EC compounds which can maintain several colors on the two separated electrodes allows this new type of pixel to be realized. The specific electrical driving gives a way to maintain both sides in the reduced EC states and this colors overlapping in the vertical view direction can achieve the black state. The four color states (G, B, W, BK) in one cell/pixel can make a valuable progress to achieve a high quality color devices such like electronic paper, outdoor billboard, smart window and flexible display using external light source.
© 2012 Optical Society of America
Original Manuscript: August 12, 2011
Revised Manuscript: November 22, 2011
Manuscript Accepted: November 23, 2011
Published: January 13, 2012
Jae Eun Jang, Seung Nam Cha, Ji Min Lee, Jun Jung Kim, Gehan A. J. Amaratunga, and Jae Eun Jung, "Multiple color reflection in a single unit cell using double-layer electrochromic reaction," Opt. Lett. 37, 235-237 (2012)