PDLC Glass for ICM’s
in its application to windows or skylights, refers
to electrically switchable glass or glazing which changes light
transmission properties when voltage is applied.
Certain types of smart glass can allow users to control the amount
of light and heat passing through: with the press of a button, it
changes from transparent to opaque, partially blocking light while
maintaining a clear view of what lies behind the window. Another
type of smart glass can provide privacy at the turn of a switch.
The use of smart glass can save costs for heating, air-conditioning
and lighting and avoid the cost of installing and maintaining motorized
light screens or blinds or curtains. When opaque, liquid crystal
or electrochromic smart glass blocks most UV, thereby reducing fabric
fading; for SPD-type smart glass, this is achieved when used in
conjunction with low-e low emissivity coatings.
Critical aspects of smart glass include installation costs, the
use of electricity, durability, as well as functional features such
as the speed of control, possibilities for dimming, and the degree
of transparency of the glass.
Polymer dispersed liquid crystal devices
In PDLCs, liquid crystal droplets are arranged in a sheet between
two layers of glass. In the "off" state, they are randomly oriented
and, when switched on, they align according to the electric field.
The liquid crystals scatter light, without blocking it, thus the
glass looks white even when in its transparent state. There is a
possibility of controlling the amount of light and heat passing
through, when tints and special inner layers are used. It is also
possible to create fire-rated and anti X-Ray versions for use in