This study discusses how conventional work scenarios can be changed by applying digital manuals with a retinal imaging display(RID), particularly focusing on the impact on workers‘ psychological states. The RID is a type of wearable display, like glasses, that enables users to view an overlay of a digital image and the real world. We conducted an experiment, in which the subjects assembled an object consisting of 10 parts, referring to a manual presented by the RID. We prepared three kinds of manual content: a picture manual in monochrome, a picture manual in full color, and a movie manual. The subjects tested the three conditions, in which each of these types of content was presented by the RID and another two conditions prepared for comparison; the same picture manual in monochrome presented on a 17-inch normal display, and the same picture manual in monochrome presented on paper. Based on the results, we make the following suggestions. When the paper manual is replaced by the digital manual, workers' task performance improves. However, for highly skilled workers, differences in display type or content design do not always improve their performance further. On the other hand, those differences can have a characteristic influence on their psychological states. In particular, 1) manuals with full-color pictures can work well in a wide range of situations, 2) manuals with monochrome pictures give workers a comfortable sense of tension and make them conscious of a professional atmosphere, and 3) movie manuals can add positive factors such as pleasure, high motivation, and strong emotional impressions.