Microfluidic multicolor display by juxtapositional color mixing with a pattern of primary color pixels

This paper describes a microfluidic multicolor display utilizing juxtapositional color mixing of pixels. Our display has a 14 × 14 array of pixels (2.5 mm in pixel diameter, 8.46 ppi) on the display surface where multicolor is expressed by controlling the pattern of the four primary color inks (cyan (C), magenta (M), yellow (Y), and black (= key plate, K)) that fill the pixels. The microfluidic display has a three-layer structure composed of a top layer with pixels for displaying images, a middle layer that serves as a background screen, and a bottom layer with microchannels that connect the pixels. In order to express multicolor by combining CMYK primary colors, we optimized the concentration of the inks used as the primary colors. By designing patterns of pixels filled with CMYK ink, color gradations and multicolor images were displayed on our display. The proposed microfluidic display could be applied to eye-friendly and low-energy-consumption flexible display applications including multi-purpose sign boards used in outdoors, wearing objects, and exterior/interior of vehicles and architects.

Multi-wavelength achromatic bifocal metalenses with controllable polarization-dependent functions for switchable focusing intensity

In this paper, bifocal metalens are designed through simultaneously controlling two polarization-dependent functions, which can respectively focus x-polarized and y-polarized light into different positions, and the relative intensity between two foci can be continuously tuned through a simple rotation of the incident linear polarization direction. The proposed metalenses are composed of rectangle nanopillars with spatially varying widths and lengths, which provide distinct propagating phases under two orthogonal polarizations. Therefore, there exists a freedom of degree to achieve two polarization-dependent focusing functions. More importantly, these nanopillars possess the excellent dispersion engineering, and provide an effective way for the realization of achromatic bifocal metalenses. After powerful optimizations, two achromatic bifocal metalenses are constructed and further demonstrated numerically. The x-polarized and y-polarized components are focused into different positions under different working wavelengths. Simulated results agree well with our designs. The approach here is expected to find optical applications in micro-manipulation, optical communication and multicolor display.

Modulating Electrons Population Pathways for Time-dependent Dynamic Multicolor Display

Multicolor luminescent nanoparticles (NPs) show several potential emerging applications. In this work, we provide a new route that integrating afterglow and upconversion (UC) origin from a single activator to achieve...

Asymmetric angular dependence for multicolor display based on plasmonic inclination nanopillar array

Asymmetric multicolor display owns unique and fascinating applications in the field of artificial color engineering, but its realization is still facing challenges due to the limits of nanofabrication techniques. In...

A new design of an electrochromic energy storage device with high capacity, long cycle lifetime and multicolor display

A new design of the electrochromic energy storage (EES) device with high capacity, long-term stability and multicolor display is proposed with high potential for practical applications.