Comparison of Readability between Liquid Crystal Displays and Cathode-Ray Tubes.

Abstract

Flat-panel displays, especially liquid crystal displays (LCDs), are almost universally used today. Do LCDs assure better readability than cathode-ray tubes (CRTs)? Two experiments were carried out to determine which type of display is better using a newly developed device. Four types of displays were tested; negative and positive CRTs, and LCDs with and without backlighting. Variables were the type of display, age, and gender. At first, analyses of readability using eye movements were conducted.Middle-aged subjects showed slower reading speed than young subjects. Then, experiments of pupillo-accommodative functions were carried out. Non-backlit LCDs reduced focusing speed among young subjects and reading performance in middle-aged subjects. Since middle-aged workers have more difficulties than young workers, they should have their vision properly corrected for VDT viewing, more appropriate displays and a more comfortable illuminance environment than young workers.

Readability of Characters on Mobile Phone Liquid Crystal Displays

“…Miyao, Hacisalihzade, Allen, et al [3] indicated the need for higher height for CRTs with low resolution. Character readability differs between the CRT and LCD [4,17]. The visual angle of 20-22' corresponds to an assumed character height of 2.9-3.2 mm at a VD of 50 cm in VDT work.…”

“…There have been many studies on the readability or legibility of printed characters and characters on cathode ray tubes (CRT) or liquid crystal displays (LCD) of computers [1,2,3,4,5,6,7], and recommended character sizes have been standardized in terms of sign displays and video display terminal (VDT) work [8,9,10,11]. The results of these studies are useful in evaluating the qualities of displays and estimating optimal character sizes for each type of display.…”

Eye problems and visual display terminals--the facts and the fallacies

“…Various forms of¯atpanel displays are being used increasingly as an alternative to conventional Cathode Ray Tube (CRT) monitors. However, such displays still account for a small proportion of the market and there is relatively little information about eye problems associated with their use (Miyao et al, 1993). For these reasons, this paper is mainly concerned with the visual ergonomics of conventional CRT-based VDTs.…”

Accommodative load from handheld game consoles in kindergarten children

“…The relationships between dark screens and visual accommodative load have previously been studied. Miyao et al 17) measured and calculated the focusing speed (the 90 percent maximum amplitude of accommodation from a distant poster to the computer monitor, divided by time spent). They found that even young subjects had lower focusing speeds when they looked at non-backlit dark LCDs than at other bright displays such as cathode ray tubes (CRTs) or backlit LCDs (p<0.05, Kruskal-Wallis test).…”