THE RELATIVE LEGIBILITY OF FIVE DIFFERENT SEGMENTED ELECTROLUMINESCENT FONTS.
Abstract
The purpose of this study was to measure the legibility of five commercial electroluminescent (EL) matrices of varying segment number: 16, 17, 23, 27, and 38. Subjects viewed all 36 alphanumerics from each font at three visual angles: 10 minutes, 15 minutes, and 30 minutes. Each character was presented for 0.25 seconds at a brightness level of about 6.60 ft-L. The results indicated that performance improved as visual angle increased. The legibility of the five fonts was found generally to fall into two groups. The 16- and 23-segment fonts were more legible than the 17-, 27-, and 38-segment styles. These findings were contrasted with previous reports, and possible explanations were discussed. As a result of this study, the following conclusions were reached: (1) No relationship between segment number and legibility was found. (2) Because of its much lower cost and complexity, the 16-segment font must be recommended for future application to EL generated alphanumeric displays. (3) Slight modifications of several characters employed in the 16-Segment font should result in fewer confusions and improved legibility. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1968
- Accession Number
- AD0840644
Entities
People
- Richard J. Schiffler
- Stanley D. Stephenson
Organizations
- Rome Laboratory