AC biased and resonated liquid crystal display
Electro-optic display devices and methods
Thermal method for controlling the optical properties of a liquid crystal and devices for the application of said method
Method of controlling an optical characteristic Patent #: 4036553
ApplicationNo. 06/114464 filed on 01/23/1980
US Classes:345/94, Waveform generation345/208, Waveform generator coupled to display elements349/161, Heating or cooling element other than for exciting349/170, Utilizing reversal in sign of dielectric anisotropy349/36, Including diverse driving frequencies349/69, Electroluminescent light source349/97Color
ExaminersPrimary: Curtis, Marshall M.
Attorney, Agent or Firm
International ClassesG02F 1/13 (20060101)
G02F 1/1335 (20060101)
G02F 1/139 (20060101)
Foreign Application Priority Data1979-01-24 GB
AbstractA liquid crystal color display comprises a cathode ray tube which emits at two or more wavelengths, a liquid crystal cell, a neutral analyzer and two color selective polarizers. The cell is switched in synchronism with different images supplied to the cathode ray tube so that the different images are observed in the different colors simultaneously. The cell is respectively switched ON and OFF by application of signals at a low frequency f1 and a high frequency fh. To avoid a patch appearance due to different parts of the liquid crystal having different twists a gap is allowed between switching the signals f1 and fh so that the total shear of the liquid crystal may be kept below a critical shear value.