THE RELATIVE LEGIBILITY OF FIVE DIFFERENT SEGMENTED ELECTROLUMINESCENT FONTS.
ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY
Pagination or Media Count:
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
- Printing and Graphic Arts