Adaptive Enhancement Display of Chromatic Electrowetting Based on Color Conversion

Abstract

Due to the charge capture of color inks in chromatic electrowetting electronic paper, the contact angle hysteresis and inconsistent aperture ratio result in a narrower color gamut and reduced contrast of the display screen. To address the issue, we propose an adaptive color conversion and dynamic enhancement display algorithm based on the aperture ratio of the chromatic electrowetting. Combined with the change of the aperture ratio, the reasonable grayscale allocation is made for color space conversion. Furthermore, considering the average grayscale values of each color, we design a method of the dynamic contrast enhancement and histogram equalization based on aperture ratio segmentation. In addition, considering the problem of grayscale loss in reflective displays, we propose an adaptive domain error diffusion algorithm with saturation enhancement to compensate for color loss. The experiments demonstrate that the images processed by our algorithm have shown certain improvements in evaluation indicators compared to images processed by other methods. Most significant of all, it has better visual display effect on chromatic electrowetting electronic paper, displaying more details.INDEX TERMS Electrowetting on dielectric (EWOD), color conversion, image enhancement, image quality optimization.