Back to results
US 3,972,587 AGranted
Liquid crystal display
AssigneeBBC Brown, Boveri & Company, Limited
InventorTerry J. Scheffer
Life of this patent
Estimating the term…
Abstract
An improved liquid crystal display apparatus is disclosed which is characterized by an especially bright and uniform readout surface. The display apparatus includes only a single polarizer placed between the light source and the liquid crystal cell, and the liquid crystal molecules are rotated through 45.degree. about an axis normal to the surface of the liquid crystal cell.
Claims14
A laminar liquid crystal cell apparatus for controlling the transmission of light from a light source comprising:
- a reflector;
- a liquid crystal cell having transparent electrodes on opposite surfaces thereof, said cell containing liquid crystal molecules helically twisted through 45.degree. about an axis normal to said electrodes, said liquid crystal cell positioned between said light source and said reflector;
- a quarter-wavelength plate located between said liquid crystal cell and said reflector, and,
- only a single polarizer located between said light source and said liquid crystal cell.
1 more element
Dependencies are inferred from the claim text.