DEVELOPMENT OF HIGH CONTRAST CATHODE RAY TUBES.
Abstract
Techniques for incorporation of a dark layer between the phosphor and the faceplate of cathode-ray tubes (CRT's) was developed with the objective of providing a moderate intensity display that would be visible under high ambient illumination. Two basic approaches to the dark layer were pursued, continuous and particulate coatings. Each technique was tested for compatibility with the CRT processing environment, and successful layers were incorporated into Sony 140CB4 CRTs for evaluation of image quality. A successful technique for incorporating a uniform particulate dark layer into the Sony tube was developed. Both small-area and large-area contrast ratios of tubes fabricated with this layer were significantly increased over those obtained in the Sony tube without the dark layer. A continuous dark layer which withstood tube processing was also developed and appeared promising. One special round tube and three Sony-type tubes with the particulate dark layer were delivered to the Air Force for evaluation. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1967
- Accession Number
- AD0819819
Entities
People
- G. Slocum
- K. Fujimoto
- P. Damon
- W. C. Hoffman
Organizations
- Hughes Aircraft Company