Ishihara S, Miyao M, Kashiwamata M, Furuta M, Kondo T, Sakakibara H, Yamada S
Department of Public Health, Nagoya University School of Medicine, Japan.
Nihon Eiseigaku Zasshi. 1993 Aug;48(3):752-6. doi: 10.1265/jjh.48.752.
Flat-panel displays, especially liquid crystal displays (LCDs), are now firmly established as important devices for information displays. But do LCDs assure better readability than cathode-ray tubes (CRTs)? We carried out an experiment using four types of displays: negative and positive CRTs, and LCDs with and without backlighting. A syllable-checking task using the Japanese katakana alphabet was conducted among fifteen healthy workers. They were divided into three groups; Group 1 had five young males aged 25 to 29, Group 2 was made up of five young females aged 18 to 24, and Group 3 consisted of five middle-aged workers who were 40 to 50 years old. We used four ambient light levels: 200 lx, 500 lx, 1250 lx without reflected glare, and 500 lx with reflected glare, on the display screens from behind. The illuminance of the glare was approximately 200 cd/m2. Multiple regression analysis showed that non-backlit LCDs reduced reading performance in middle-aged subjects significantly. Since middle-aged workers have more difficulties than young workers, they need more appropriate displays and a more comfortable illuminance environment than younger workers.
平板显示器，尤其是液晶显示器（LCD），现已稳固地确立为信息显示的重要设备。但是液晶显示器是否比阴极射线管（CRT）具有更好的可读性呢？我们使用四种类型的显示器进行了一项实验：阴性和阳性阴极射线管，以及有背光和无背光的液晶显示器。在15名健康工作者中进行了一项使用日语片假名的音节检查任务。他们被分为三组；第一组有五名年龄在25至29岁之间的年轻男性，第二组由五名年龄在18至24岁之间的年轻女性组成，第三组由五名年龄在40至50岁之间的中年工作者组成。我们从后面在显示屏上使用了四种环境光照水平：200勒克斯、500勒克斯、1250勒克斯且无反射眩光，以及500勒克斯且有反射眩光。眩光的照度约为200坎德拉每平方米。多元回归分析表明，无背光的液晶显示器显著降低了中年受试者的阅读性能。由于中年工作者比年轻工作者有更多困难，他们比年轻工作者需要更合适的显示器和更舒适的光照环境。
