Liquid crystal electrically-controlled birefringence display dev

Details Liquid crystal electrically-controlled birefringence display dev Liquid crystal electrically-controlled birefringence display dev

1987-11-05

1989-08-22

Miller, Stanley D.

350337, 350347E, G02F 113

Patent

active

048590371

ABSTRACT:
The present invention provides an improved positive type liquid crystal display device in the birefringence mode, wherein at least one of the polarizers is a colored polarizer including the character of making the background color of the display approximately white, thereby improving the contrast ratio extremely. Further, in the negative type liquid crystal display device, a color filter for absorbing the light of the wavelength area which transmits at the time of an off state and non-selecting, is provided in series with respect to a light source and the liquid crystal display portion, thereby preventing the color shading of the background color.

REFERENCES:
patent: 3785721 (1974-01-01), Harsch
patent: 4652087 (1987-03-01), Bos et al.
patent: 4674841 (1987-06-01), Buzak

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