title: Visual Costs of the Inhomogeneity of Luminance and Contrast by Viewing LCD-TFT Screens Off-Axis.
abstract: In this study the anisotropic characteristics of TFT-LCD (Thin-Film-Transistor-Liquid Crystal Display) screens were examined. Anisotropy occurs as the distribution of luminance and contrast changes over the screen surface due to different viewing angles. On the basis of detailed photometric measurements the detection performance in a visual reaction task was measured in different viewing conditions. Viewing angle (0 degrees, frontal view; 30 degrees, off-axis; 50 degrees, off-axis) as well as ambient lighting (a dark or illuminated room) were varied. Reaction times and accuracy of detection performance were recorded. Results showed TFT's anisotropy to be a crucial factor deteriorating performance. With an increasing viewing angle performance decreased. It is concluded that TFT's anisotropy is a limiting factor for overall suitability and usefulness of this new display technology.
authors.affiliation: Psychology Department, Aachen University, Aachen, Germany. martina.ziefle@psych.rwth-aachen.de
authors.forename: Martina
authors.initials: M
authors.lastname: Ziefle
authors.forename: Thomas
authors.initials: T
authors.lastname: Groeger
authors.forename: Dietmar
authors.initials: D
authors.lastname: Sommer
mesh_terms: D000328:Adult; D016880:Anisotropy; D016288:Computer Terminals; D005260:Female; D006801:Humans; D008027:Light; D008029:Lighting; D008297:Male; D010783:Photometry; D011187:Posture / Q000502:physiology; D011930:Reaction Time; D013647:Task Performance and Analysis; D014796:Visual Perception / Q000502:physiology*