| 摘要 |
A device which can be switched between a light-scattering and a non light-scattering condition comprises, in an element thereof, a volatile liquid and a container having a front viewing face and a darkened back face. The front viewing face has a rough inner surface with a transparent thin resistive layer over the rough surface. The resistive layer takes on the rough surface configuration of the front face. In operation, a current is passed through the resistive layer to heat the volatile liquid until it boils. The rough surface provides a multiplicity of nucleation sites for boiling of the liquid. When the liquid boils, the device scatters light and appears white to the viewer. When the liquid is in its quiescent state, light passes through the front face and the liquid without substantial scattering and the device appears dark due to the darkened back face.
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