Light polarisation is a fascinating phenomenon which plays a key role in the functioning of LCD screens (Liquid Crystal Display). By using liquid crystals, LCD screens manage polarisation to control the light intensity and colour of the displayed images. But what about invisible LCD screens? This novel concept relies on advanced polarisation principles.

In a traditional LCD screen, light passes through polarizing filters. These filters allow only light with oscillations that occur in a specific direction to pass through. Liquid crystals, when under an electric field, modify the polarisation direction of the light which passes through them. By adjusting these angles, it is possible to create visible images while controlling the light that emerges from the screen.

In order to produce an invisible LCD screen, researchers explore techniques that use polarisation in a more subtle way. The idea would be to integrate systems that manipulate light so that it is polarised to blend in with its surroundings. For instance, adaptative polarising filters could be used to adjust the reflected light and make the screen almost undetectable to the human eye. Such developments could revolutionise certain fields such as augmented reality where the discreet interaction with digital information is crucial.

Ongoing research on metamaterials and display technologies based on nano-structuration supports this vision. These materials can possess unique optical properties, allowing for the control of light polarisation in order to obtain an almost transparent display. Its potential applications are vast, from portable devices to surface-integrated display technologies.

Thereby, polarisation is not merely a theorical concept; it is essential for next generation display technologies.