Since 1830, 3D stereoscopic installations have arisen. However, these kinds of installation were un-naked-eye and needed wearing additional glasses to get the stereoscopic effect. At present, the inconveniences of un-naked-eye displays have been solved by the research which continued along with the technology breakthrough. The naked-eye types have been developed. However, using the present 3D stereoscopic display types for a long time, the users may feel insufficient visual angle, eye strain, dizziness, etc. Therefore, this research investigated the effects of different stereoscopic display types (barrier, lenticular and 2D-plus-depth) based on different viewing angles (0˚, 15˚, 30˚) for multi-users. Subjective evaluations (comfort, stereo, crosstalk) and objective measures (accommodation time, CFF, visual acuity) of human factors assessment were applied. We employed systematic experiments and statistical analyses in this study. The experimental results indicated that 2D-plus-depth type was the best one, no matter in subjective evaluations or objective measures. The 2D-plus-depth type resulted in the highest comfort and stereo effect, and the lowest in visual fatigue and crosstalk. For viewing angle factor, stereo at 0˚ viewing angle was not different from that at 15˚ viewing angle but was apparently higher than that at 30˚ viewing angle. The main outcome of this research was to propose the most appropriate type of stereoscopic displays for design and users. Moreover, applying the factor of viewing angle could find out the conditions and limitations of stereoscopic display for multi-users by human factors assessment.
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