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The surrounding light goes through the front glass, a liquid crystal layer of 0,025 mm thickness, and is absorbed in the black back plate. On both glass plates, conductive transparent electrodes are attached. When a voltage between 10 and 20 volts is applied on the electrodes, the arrangement of the molecules is destroyed by the collisions of the moving ions, scattering the light and causing this part of the LCD to look darker than the rest of the display.
By replacing the black plate with a mirror it is possible to use the cell in a reflective mode. The segments which are not energised let the light go past, which will cause the mirror to reflect the light and compose the digits. The layer in the electric field between the electrodes scatters the light in all directions and looks dark.
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