Full-color reflective cholesteric liquid crystal display

Xiao-Yang Huang; Asad A. Khan; Donald J. Davis; Gregg M. Podojil; Chad M. Jones; Nick Miller; J. William Doane

doi:10.1117/12.343863

26 March 1999 Full-color reflective cholesteric liquid crystal display

Xiao-Yang Huang, Asad A. Khan, Donald J. Davis, Gregg M. Podojil, Chad M. Jones, Nick Miller, J. William Doane

Proceedings Volume 3635, Liquid Crystal Materials, Devices, and Applications VII; (1999) https://doi.org/10.1117/12.343863
Event: Electronic Imaging '99, 1999, San Jose, CA, United States

Abstract

We report a full color 1/4 VGA reflective cholesteric display with 4096 colors. The display can deliver a brightness approaching 40 percent reflected luminance, far exceeding all other reflective technologies. With its zero voltage bistability, images can be stored for days and months without ny power consumption. This property can significantly extend the battery life. The capability of displaying full color complex graphics and images is a must in order to establish a market position in this multimedia age. Color is achieved by stacking RGB cells. The top layer is blue with right chirality, the middle layer is green with left chirality, and the bottom layer is red with right chirality. The choice of opposite chirality prevents the loss in the green and red spectra from the blue layer on the top. We also adjusted the thickness of each layer to achieve color balance. We implement gray scale in each layer with pulse width modulation. This modulation method is the best choice consideration of lower driver cost, simpler structure with fewer cross talk problems. Various drive schemes and modulation methods will be discussed in the conference.

Citation Download Citation

Xiao-Yang Huang, Asad A. Khan, Donald J. Davis, Gregg M. Podojil, Chad M. Jones, Nick Miller, and J. William Doane "Full-color reflective cholesteric liquid crystal display", Proc. SPIE 3635, Liquid Crystal Materials, Devices, and Applications VII, (26 March 1999); https://doi.org/10.1117/12.343863

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