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. 20, 1997
Filed:
Mar. 14, 1995
Hideo Adachi, Iruma, JP;
Takashi Mihara, Iruma, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A plurality of electrical light-emitting surface light source elements are arranged in a matrix form on a semiconductor substrate. Each of the surface light source elements has a ferroelectric capacitor portion and an electrical light-emitting portion. The capacitor portion has a lower electrode formed on the substrate, a ferroelectric thin film formed on the lower electrode, and an upper electrode formed on the thin film with an electron emission hole. The light-emitting portion has a carrier acceleration/multiplication layer formed on the upper electrode by a semiconductor layer, a light-emitting layer formed on the acceleration/multiplication layer, and a transparent electrode formed on the light-emitting layer. A plurality of switching elements are formed on the substrate in correspondence with the surface light source elements. A voltage applied across the upper and lower electrodes of the capacitor portion of a corresponding one of the surface light source elements according to a drive signal selectively supplied to the switching elements is inverted. Electrons emitted from the electron emission hole by polarization reversal generated in the thin film are injected in the light-emitting portion through the acceleration/multiplication layer to cause the light-emitting portion to selectively emit light, thereby obtaining visible light through the transparent electrode.