Transparent surfaces that become opaque

  • #1
Summary:
Surfaces that change transparency.
Are there any materials that go from transparent to opaque when a bright light is shined on it? In particular I would like something that acts like a window until I project a movie onto it and then is opaque in the regions where the light hits it at certain levels of brightness.
 

Answers and Replies

  • #3
Baluncore
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Are there any materials that go from transparent to opaque when a bright light is shined on it? In particular I would like something that acts like a window until I project a movie onto it and then is opaque in the regions where the light hits it at certain levels of brightness.
If sunshine falls on the window, or it is a bright day, the window will become opaque.
No projector can compete with sunlight.
Maybe an LCD window is needed with a separate control.
 
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  • #4
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You can also get glass which becomes opaque when you pass a current through it.

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1619737487374.png


https://www.smartglassinternational.com/electric-switchable-glass/
 
  • #5
If sunshine falls on the window, or it is a bright day, the window will become opaque.
No projector can compete with sunlight.
Maybe an LCD window is needed with a separate control.
I would not use it in sunlight.
 
  • #7
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You can also get glass which becomes opaque when you pass a current through it.
Erm. Does this means that these will switch transparent in case of a power outage?

Just asking :doh:
 
  • #8
Baluncore
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Erm. Does this means that these will switch transparent in case of a power outage?
Smart glass does not have “a current pass through it” as that would be very inefficient. Switchable glass has a liquid crystal film, between transparent conductive layers, within the laminate that change optical characteristics when subjected to an electric field.
The glass becomes transparent only when a voltage is applied.
Loss of power does not lead to loss of dignity.
 

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