ELECTROLUMINESCENT THIN FILM RESEARCH.
Abstract
Unique vacuum deposition procedures and special evaporation sources designed to give increased activator concentration were used to prepare a variety of improved, electroluminescent (EL) phosphor thin films on glass substrates. High resolution electrode patterns were used in fabricating EL test panels from these substrates. The useful operating lifetime of several of these phosphor films was demonstrated to be in excess of 2200 hours. Solid-state switching and scanning circuits were developed for use with crossed-electrode thin film EL display elements. Low duty cycle excitation was used to measure panel performance under a variety of conditions. Brightness-voltage curves (excitation frequency and frame rate fixed) with duty cycle as a parameter were measured. Duty cycle was held constant and brightness-voltage curves obtained as a function of excitation frequency. Brightness uniformity and suppression ratios were determined for several cross-grid EL display panels with active areas ranging in size from 1 to 51.3 square inches. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 10, 1967
- Accession Number
- AD0815950
Entities
People
- E. J. Soxman
- W. A. Smith Jr.