The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 1989
Filed:
Nov. 05, 1987
Yukihiro Iwashita, Suwa, JP;
Masashi Mochizuki, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
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.