Type GH liquid crystal protective glasses and covering structural frame

A protective and/or sun lens assembly, comprising:

• at least one structural lens made of plastic material;
• and
• at least one liquid crystal film of the guest-host type, arranged on an inner side of the at least one structural lens and controlled by an electronic board powered by an energy source;
• wherein the electronic board controls activation of the at least one LC film, provided with a maximum transparency state, as a function of an ambient lighting level so that the at least one LC film remains in said maximum transparency state until reaching a lighting threshold, after which the at least one LC film begins to reduce transparency as ambient lighting increases.

A method for controlling a level of transparency of a protective and/or sun lens assembly, said protective and/or sun lens assembly comprising at least one structural lens made of plastic material and at least one liquid crystal film of the guest-host type, arranged on an inner side of the at least one structural lens and controlled by an electronic board powered by a photovoltaic cell, said method comprising:

• controlling activation of the at least one LC film, provided with a state of maximum visible light transmission level, by the electronic board as a function of an ambient lighting level as follows:
• maintaining the at least one LC film in the state of maximum VLT level until a lighting threshold is reached;
• and
• once the lighting threshold has been exceeded, reducing the maximum VLT level as ambient lighting increases.