Abstract: A solid display is provided by a semiconductor switched between transparent and opaque conditions according to external removal of carriers from the conduction band for controlling absorption of light-energy. A semiconductor has an energy band gap affording a normally saturated conduction band in response to impinging light energy of a given range wavelength. The normally saturated condition of the semiconductor prevents further absorption, and enables light to pass thererthrough. The semiconductor is switched to an opaque condition by completing an electric circuit for removing carriers from the conduction band to enable further absorption of incident light in the semiconductor by raising additional carriers from the valence band to the conduction band.