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:
Jul. 01, 1980
Filed:
Jul. 19, 1978
Chuji Suzuki, Nara, JP;
Masahiro Ise, Tenri, JP;
Kenzo Inazaki, Tenri, JP;
Katsuyuki Machino, Tenri, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
For a thin-film EL display panel which exhibits the hysteresis loop phenomenon in the applied voltage versus brightness relationship, a string of alternating sustain pulses are applied, the amplitude of which is chosen at the voltage level appearing at the point in the hysteresis loop characteristics where the difference between the minimum light brightness on the voltage increasing curve and the maximum light brightness on the voltage decreasing curve is substantially a maximum. A flash lamp, for example, a xenon lamp which releases light beams toward the thin-film EL display panel, is energized in synchronism with the application period and pause period of the alternating sustain pulses. There are provided means for controlling the application period of the alternating sustain pulses and the illumination period of the flash lamp in accordance with the light activated write mode or erase mode. The light beams can be applied to the thin-film EL display panel via a film bearing an optical image to be written or erased.