Comparison of viewing angle and observer performances in different types of liquid-crystal display monitors

Abstract

It is known that the performance of liquid-crystal display (LCD) monitors, such as the luminance and contrast ratio, is dependent on the viewing angle. Our purpose in this study was to compare the angular performance and the effect on observer performance of different types of LCD monitors. The luminance performance and contrast ratio as a function of viewing angle (-60 degrees to 60 degrees) in each direction for two types of LCD monitors, namely, a general-purpose LCD monitor and one especially designed for medical use, were measured in this study. Furthermore, the observer performance at various viewing angles in the horizontal direction for a medical-grade LCD monitor was investigated by eight observers based on a contrast-detail diagram. The two types of LCD monitors showed notable variations in luminance and contrast ratio as a function of the viewing angle. Acceptable viewing angles in terms of the contrast ratio were much smaller in each direction than those for nominal viewing angles in the specifications provided by the manufacturers, and those for the medical-grade LCD monitor in the horizontal and vertical directions were broader than those of the general-purpose LCD monitor. There was no significant difference in observer performance between 0 degrees and 40 degrees. On the other hand, our results showed a statistically significant difference in observer performance between 0 degrees and 60 degrees.

Impact of 222 Nm Uv-C Radiation on Color Accuracy of Video Displays in Public Buses

“…Authors have investigated factors that may affect the performance of these displays, including luminance inhomogeneity, viewing angle, resolution, magnification, and window settings (Kawamoto et al, 2017). Others (Hatanaka et al, 2009) have investigated the effect of viewing angle on observer performance and compared the performance of different types of displays. This is crucial in applications such as radiological imaging, where display performance plays a critical role in diagnostic accuracy.…”

The validity of different display monitors in the assessment of dental implant site dimensions in cone beam computed tomography images

“…Such factors may include viewing distance and angle, maximum and minimum luminance, the luminance response (characteristic) curve, grayscale bit depth, background ambient lighting and display software [8][9][10][11]. Studies in the medical literature have found that such factors can affect the diagnostic outcome for a variety of diagnostic tasks [12,13].…”