Synthetic Evaluation Method of Electronic Visual Display Terminal Visual Performance Based on the Letter Search Task

Today the electronic visual display terminal (VDT) plays an indispensable role in people’s life, so the visual performance of VDT is very important. In order to evaluate the visual performance of VDT from the perspective of user experience more accurately and reliably, we synthesize three kinds of commonly used visual performance assessment techniques, i.e. main task measure method, physiology measure method and subjective evaluate method, and establish a system to evaluate the visual performance of VDT. We use pseudo-text letter search task as the main task, analyze and extract suitable evaluation indicators, and calculate the weight of these evaluation indicators by the entropy method. At last, a qualification visual performance evaluation value of each VDT is got. The experimental result shows that this evaluation value is consistent with the subjective score in general. The evaluation system is combined with present main evaluation methods of visual performance and utilizes their advantages. The evaluation result can be quantified more directly and clearly. It provides a reference for the visual performance evaluation from the perspective of user experience.