Patent Document ID: 8581935
Application ID: 12496026
Patent Status: 1

Claim One:
1. An apparatus with an orientation-following display, comprising: a display device having a screen that can be positioned in arbitrary postures including a reference posture relative to a real-world space having a reference horizontal orientation, the screen having an xyz orthogonal coordinate system fixed to the screen, an x axis of the xyz orthogonal coordinate system being set parallel to a lateral direction in the real-world space when the screen is positioned at the reference posture and a z axis of the xyz orthogonal coordinate system being perpendicular to the screen, the posture of the screen in the real-world space being defined by z-x-z Euler angles α, β, and γ of the xyz orthogonal coordinate system, wherein α≠0, β≠0, and γ≠0, wherein the screen displays an image to enable recognition of the reference horizontal orientation of the real-world space such that the reference horizontal orientation recognized in the screen coincides with the reference horizontal orientation of the real-world space when the image is displayed on the screen at the reference posture; and a control device that derives α+γ as an angle by which the image is rotated so that the reference horizontal orientation recognized from the image follows the reference horizontal orientation of the real-world space when the image is displayed on the screen at arbitrary postures.