Low optical efficiency is a drawback of a dual-view integral imaging display based on a pinhole array. Therefore, we propose a high optical-efficiency dual-view integral imaging display. It is composed of a display panel and a non-uniform pinhole array. The left-view and right-view sub-elemental images are alternatively aligned in horizontal direction. The horizontal aperture widths of the pinholes are identical. The horizontal light rays from the left-view and right-view sub-elemental images are modulated into different directions. The vertical aperture widths of the pinholes are enlarged from upper and lower edges to center. Therefore, the vertical light rays from the sub-elemental images are not parallel. The vertical viewing angle is related to the vertical aperture width of the first row pinhole, whereas the optical efficiency is related to the vertical aperture widths of all pinholes. The optical efficiency is improved by optimizing the vertical aperture widths of the pinholes. A prototype is developed, and the experimental results prove the hypothesis.