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:
Mar. 22, 1994
Filed:
Dec. 07, 1992
Tomotoshi Tsujioka, Yamatokoriyama, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A liquid crystal display apparatus has a lamination structure in which an upper polarizer, a phase difference plate, a supertwisted nematic liquid crystal cell sandwiched between upper and lower substrates, a lower polarizer, and a reflection plate are stacked in this sequence. In order to obtain an achromatic display which is stable against the temperature change, the retardation Re of the phase difference plate is set to 555 to 580 nm, the product d.multidot..DELTA.n of the liquid crystal cell thickness and the refractive anisotropy of the liquid crystal display element is set to 0.76.+-.0.02, the angle .alpha. formed by the liquid crystal molecular orientation axis of the upper substrate and the upper polarizer is set to 55 to 65 deg., the angle .beta. formed by the liquid crystal molecular orientation axis of the lower substrate and the lower polarizer is set to 40 to 50 deg., the angle .theta. formed by the liquid crystal molecular orientation axis of the upper substrate and the optical axis of the phase difference plate is set to 120 to 130 deg., and the twisting angle of the liquid crystal molecule is set to 240 deg.