LCD Window Shutters Offer a Different View

Apr-30-15 LCD window shutters that could switch from transparent to opaque allow the user to essentially change the view outside the window.

Previous versions of light shutters have been less than ideal, and have relied on either scattering technology, which will not allow a black color, or absorption technology, which won’t allow the background to be completely blocked.

In development by a team at Pusan National University, the new “transparent window display” overcomes these limitations by scattering and absorbing light at the same time. The display is made up of a polymer network of vertically aligned liquid crystal cells that have been doped with dichronic dyes. As the polymer structure scatters the incoming light, the dichroic dyes absorb it. When the display is turned on, electrodes arranged above and below the screen deliver an electric current that aligns the dye molecules with the incoming light to create an opaque display. Turning the screen off renders it transparent again.

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