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:
Jan. 12, 1993
Filed:
Sep. 26, 1991
Mark D Kellam, Chapel Hill, NC (US);
MCNC, Research Triangle Park, NC (US);
Abstract
An electroluminescent display device including a semiconductor substrate having a phosphor layer on one face thereof, and a space charge removing means in the semiconductor substrate. The space charge removing means continuously removes carriers, typically electrons, from the space charge barrier region formed during device operation, to thereby reduce space charge barrier related brightness limitations. The space charge removing means may comprise a doped region in the semiconductor substrate adjacent the phosphor layer, which is DC biased to continuously remove electrons from the space charge region. Alternatively, the doped region in the substrate adjacent the phosphor layer may inject electrons into the phosphor layer, with space charge removal being accomplished by a DC biased substrate contact. The space charge region in the substrate is reduced or eliminated thereby increasing the maximum number of electrons which can be injected into the electroluminescent layer and increasing the brightness of the display device.