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IP.com Disclosure Number: IPCOM000253655D
Publication Date: 2018-Apr-20

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The IP.com Prior Art Database


A controllable light shielding apparatus that functions through the use of electrochromic materials is provided. Electrochromic devices (ECDs) are composed of multiple material layers that provide a reversible, electrochemical, reduction-oxidation (redox) reaction that changes the transparency of the material based on applied voltage potentials. The outer layers are electrodes made from two glass or plastic substrates coated with a transparent, electrically polarizable material such as indium tin oxide or ITO. These opposing electrodes allow for the polarization of the two middle layers, the electrolyte and the electrochromic material (ECM), activating the chemical reaction. The electrolyte layer is composed of ions (usually lithium) dissolved in a solution. When the ions in the solution are polarized by the electrodes, the positive and negative solutes move toward opposite faces of the layer, allowing them to interact with the ECM. The interaction causes a redox reaction that changes the ECM chemical species to one that attenuates more light as well as expresses a different color visually (e.g., from transparent to blue), which is a process known commonly as electrochromism.