| Summary: | 碩士 === 國立臺灣師範大學 === 圖文傳播學系 === 99 === To understanding the appropriate font size and type of Chinese characters of EPG/ESG, as a basis for IPTV UI design, experiment approaches were taken in this research for surveying the users’ preference for font size and type of characters of EPG from users’ subjective point of view. A set of simulated EPG were deployed. 20 levels of independent variables of size from 2.5%~6.5% character/screen height ratio were given and the 12 levels of independent variables of type were Hei, Kai, Ming and Yuan with different weight, bold, middle and, light for each type. The differences of effects on users’ preference between different scree size, 21’ and 42”, and different resolution, SDTV and HDTV, were also compared.
For the effects of character sizes on users’ subjective feeling of legibility, there is no significant difference between SD and HD EPG. However screen size does. For 21” television, subjects felt legible when the visual angle of character was more than 25 minutes, or character/screen height ratio more than 4.6%. While less than 21 minutes or 3.8%, it did not. For 42” television, subjects felt legible when visual angle of character was more than 31 minutes, or character/screen height ratio more than 4.6%. Those less than 22 minutes or 2.9% were illegible.
For the effects of character sizes on users’ preference, there is no significant difference between SD and HD EPG. However screen size does. For 21” television, subjects preferred when visual angle of character was more than 28 minutes, or character/screen height ratio more than 5.0%. Those less than 23 minutes or 4.2% were unpleasing. For 42” television, subjects felt pleasing when visual angle of character was more than 32 minutes, or character/screen height ratio more than 4.4%. Subjects disliked those less than 28 minutes or 3.8%.
For the effects of character type on users’ preference, subjects preferred serifless Hei and Yuan type than Kai and Ming. There is no significant difference between SD and HD EPG, nor between different screen sizes.
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