Variable Tint Lens Using Dichroic Dyes for Fast Light Switching

The patent changes the physical state and optical parameters of the liquid crystal molecules through voltage control. By applying voltage, the liquid crystal molecules transition from a disordered state (allowing light passage) to an ordered state (blocking light), achieving rapid transmittance switching. This parameter-based control enables response times significantly faster than photochromic materials while maintaining adaptability through electronic control.

The patent replaces the chemical mechanism of photochromic glass with an electro-optical system using liquid crystals and dichroic dyes. Instead of relying on slow chemical reactions triggered by UV exposure, the system uses electrical fields to rapidly reorient liquid crystal molecules, which in turn control the orientation of dichroic dye molecules for fast optical switching.

The patent combines liquid crystal molecules with dichroic dye molecules to create a composite system. The liquid crystal provides voltage-controlled orientation, while the dichroic dye provides selective light absorption based on molecular orientation. This composite structure achieves both efficient voltage control and high light transmittance, with the transparent state reaching up to 80% transmittance compared to 36% in conventional TN liquid crystal glass.

The patent utilizes the color-changing properties of dichroic dyes that change their light absorption characteristics based on molecular orientation. When liquid crystal molecules reorient under voltage, the attached dichroic dye molecules follow suit, changing from absorbing light (dark state) to transmitting light (transparent state), thereby achieving high transmittance range.