A Laboratory Method to Simulate Spatial Legibility of Displays
The luminance contrast (C) and light intensity (Lt) of text and graphics viewed at different off-axis angles determine the spatial legibility of displays, along with other critical factors. These two variables (C, Lt) are largely affected by the surface reflectances or transmittance, from lambertian (ideal diffusive) to specular, of different displays. Using a redefined Legibility Index (LI9), this paper introduces a laboratory simulator to facilitate assessing the spatial legibility of wide variety of displays with different surface reflectances or transmittances. The simulator uses a dimmable fixture (1 ％ dimming) that can be horizontally rotated and vertically tilted. Viewing materials are printed on clear acrylic sheets and then attached on the diffusive opalescent surface of the fixture. Subjects sit at a constant distance away with their head on a chin rest to recognize the viewing materials at preset off-axis angles. Different surface reflectances or transmittances of the same display viewed at different off-axis angles are simulated by dinuning the background luminance of the viewing materials to the designed values. Besides simulating existing displays, this laboratory simulator can also be used to design displays with expected spatial distribution of legibility.
Spatial Legibility of Displays Surface Reflectance or Transmittance Laboratory Simulation off-axis Viewing Angles
Hongyi Cai
Taubman College of Architecture & Urban Planning,University of Michigan, Ann Arbor, MI 48109-2069, U.S.A
国际会议
上海
英文
974-977
2007-03-12（万方平台首次上网日期，不代表论文的发表时间）