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:
May. 26, 1992
Filed:
Sep. 30, 1991
Ricoh Company, Ltd., Tokyo, JP;
Abstract
Disclosed herein is a liquid crystal display comprising liquid crystal material sandwiched between two substrates, a plurality of picture element electrodes disposed on at least one of the substrates, a lead electrode connected with the picture element electrodes by means of at least one conductor-insulator-conductor device, and a light-shielding layer disposed in a region other than the display region on at least one of the substrates, the insulator being a hard carbon film. The insulator may simultaneously serve as a light-shielding layer, wherein a hard carbon film having a thickness of 1100 to 8000 .ANG., a specific resistivity (.rho.) of 10.sup.6 to 10.sup.13 ohm cm, an optical band gap (Egopt) of 1.0 to 3.0 eV, a hydrogen amount in the film (C.sub.H) of 10 to 50 atom %, an SP.sup.3 /SP.sup.2 ratio of 2-4, a Vickers hardness of 2500 to 9500 kg.multidot.mm.sup.-2, a refractive index (n) of 1.9 to 2.4, a defect density of 10.sup.17 to 10.sup.19 cm.sup.-3, a specific dielectric constant of 2 to 6, and an average optical density in the visible ray region of not less than 0.5 is used.