Abstract
The quality of an STN LCD (Liquid Crystal Display) with backlight was evaluated. The LCD was shown to thirty participants, and they were asked to rank-order ten main factors which are affecting the quality of this panel, which were extracted from many factors found out in a previous test. Before this test, each participant was asked to choose the preferred display mode (positive/negative), and to adjust brightness and contrast as preferred. A paired comparison method was used to aid participants rank-order factors easier since they normally do not have clear criteria on these factors.
A half of participants preferred the positive mode and the rest preferred the negative. The luminances (Lmax) adjusted by the participants ranged from 13cd/m2 to 136cd/m2. The mean of the luminances (Lmax) adjusted in the positive mode was significantly higher than that in the negative mode. The result of the paired comparison indicated that “Luminance Uniformity” was the top factor to be improved most in the positive mode. On the other hand in the negative mode, “Reflection/Glare” was the most required to be improved. The priority order was made clear of those factors to improve the quality of the LCD in this study.
