Related Experiment Video
Updated: Jun 20, 2026
10:33
An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
Published on: February 27, 2019
Rapidly switchable optical filter for color generation
Optics Letters
|September 25, 2009
Abstract:
A ferroelectric liquid-crystal (FLC) color filter is described and experimentally demonstrated. The device consists of three polarizers and five smectic C* FLC cells. With the application of an appropriate electric field to each FLC cell, five outputs are observed. These consist of the three primary colors (red, green, and blue) along with white and black. With the rapid addressing speed of the FLC's, the FLC color filter can be used for color display applications, such as backlighting FLC television.
Related Concept Videos
01:24Color Vision
Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
01:22Photoreceptors and Visual Pathways
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...