68.5L: <i>Late‐News Paper</i> : Advances in Active‐Matrix Color Displays Using Electrophoretic Ink and Color Filters

Abstract

Abstract An improved full color active matrix electronic paper display (EPD) prototype using a custom design color filter array with E Ink's electrophoretic technology is reported. Improvements over previous efforts are achieved by using a) improved ink formulations with higher dynamic range, b) 4 bit gray scale for each color and c) a color filter design with RGBW pixel layout to improve brightness and dynamic range. As a result, the whiteness of the background page is preserved while enabling color. In addition, due to the “paper‐like” optics, the brightness and saturation of the optical states are largely independent of viewing angle or illumination conditions.